diff --git a/sql/core/src/test/resources/sql-tests/inputs/arithmetic.sql b/sql/core/src/test/resources/sql-tests/inputs/arithmetic.sql
index f62b10ca0037..79815099c59a 100644
--- a/sql/core/src/test/resources/sql-tests/inputs/arithmetic.sql
+++ b/sql/core/src/test/resources/sql-tests/inputs/arithmetic.sql
@@ -4,17 +4,17 @@ select -100;
 select +230;
 select -5.2;
 select +6.8e0;
-select -key, +key from testdata where key = 2;
-select -(key + 1), - key + 1, +(key + 5) from testdata where key = 1;
-select -max(key), +max(key) from testdata;
+select -key, +key from uniqueRowData where key = 2;
+select -(key + 1), - key + 1, +(key + 5) from uniqueRowData where key = 1;
+select -max(key), +max(key) from uniqueRowData;
 select - (-10);
-select + (-key) from testdata where key = 32;
-select - (+max(key)) from testdata;
+select + (-key) from uniqueRowData where key = 32;
+select - (+max(key)) from uniqueRowData;
 select - - 3;
 select - + 20;
 select + + 100;
-select - - max(key) from testdata;
-select + - key from testdata where key = 33;
+select - - max(key) from uniqueRowData;
+select + - key from uniqueRowData where key = 33;
 
 -- div
 select 5 / 2;
diff --git a/sql/core/src/test/resources/sql-tests/inputs/limit.sql b/sql/core/src/test/resources/sql-tests/inputs/limit.sql
index 2ea35f7f3a5c..a37c631f015e 100644
--- a/sql/core/src/test/resources/sql-tests/inputs/limit.sql
+++ b/sql/core/src/test/resources/sql-tests/inputs/limit.sql
@@ -1,23 +1,23 @@
 
 -- limit on various data types
-select * from testdata limit 2;
+select * from uniqueRowData limit 2;
 select * from arraydata limit 2;
 select * from mapdata limit 2;
 
 -- foldable non-literal in limit
-select * from testdata limit 2 + 1;
+select * from uniqueRowData limit 2 + 1;
 
-select * from testdata limit CAST(1 AS int);
+select * from uniqueRowData limit CAST(1 AS int);
 
 -- limit must be non-negative
-select * from testdata limit -1;
+select * from uniqueRowData limit -1;
 
 -- limit must be foldable
-select * from testdata limit key > 3;
+select * from uniqueRowData limit key > 3;
 
 -- limit must be integer
-select * from testdata limit true;
-select * from testdata limit 'a';
+select * from uniqueRowData limit true;
+select * from uniqueRowData limit 'a';
 
 -- limit within a subquery
 select * from (select * from range(10) limit 5) where id > 3;
diff --git a/sql/core/src/test/resources/sql-tests/inputs/outer-join.sql b/sql/core/src/test/resources/sql-tests/inputs/outer-join.sql
new file mode 100644
index 000000000000..dc8c858ae2dd
--- /dev/null
+++ b/sql/core/src/test/resources/sql-tests/inputs/outer-join.sql
@@ -0,0 +1,334 @@
+-- A data set containing uppercase column names and column values
+CREATE OR REPLACE TEMPORARY VIEW lowerCaseData AS SELECT * FROM VALUES
+(1, "a"),
+(2, "b"),
+(3, "c"),
+(4, "d")
+as lowerCaseData(n, l);
+
+-- A data set containing uppercase column names and column values
+CREATE OR REPLACE TEMPORARY VIEW upperCaseData AS SELECT * FROM VALUES
+(1, "A"),
+(2, "B"),
+(3, "C"),
+(4, "D"),
+(5, "E"),
+(6, "F")
+as upperCaseData(N, L);
+
+-- A data set containing null
+CREATE OR REPLACE TEMPORARY VIEW nullData AS SELECT * FROM VALUES
+(201, null),
+(86, "val_86"),
+(null, "val_null"),
+(165, "val_165"),
+(null, null),
+(330, "val_330"),
+(165, null)
+as nullData(key, value);
+
+-- A data set containing duplicate rows
+CREATE OR REPLACE TEMPORARY VIEW duplicateRowData AS SELECT * FROM VALUES
+(251, "val_251"),
+(86, "val_86"),
+(165, "val_165"),
+(330, "val_330"),
+(165, "val_165")
+as duplicateRowData(key, value);
+
+-- basic full outer join
+SELECT * FROM
+  (SELECT * FROM upperCaseData WHERE N <= 4) leftTable FULL OUTER JOIN
+  (SELECT * FROM upperCaseData WHERE N >= 3) rightTable
+    ON leftTable.N = rightTable.N;
+
+-- basic right outer join
+SELECT * FROM lowercasedata l RIGHT OUTER JOIN uppercasedata u ON l.n = u.N;
+
+-- basic left outer join
+SELECT * FROM uppercasedata u LEFT OUTER JOIN lowercasedata l ON l.n = u.N;
+
+-- left-outer join over two nested table expressions
+SELECT c.c1, c.c2, c.c3, c.c4
+FROM (
+  SELECT a.c1 AS c1, a.c2 AS c2, b.c3 AS c3, b.c4 AS c4
+  FROM
+  (
+    SELECT src1.key AS c1, src1.value AS c2
+    FROM duplicateRowData src1 WHERE src1.key > 100 and src1.key < 300
+  ) a
+  LEFT OUTER JOIN
+  (
+    SELECT src2.key AS c3, src2.value AS c4
+    FROM duplicateRowData src2 WHERE src2.key > 200 and src2.key < 400
+  ) b
+  ON (a.c1 = b.c3)
+) c;
+
+-- right-outer join over two nested table expressions
+SELECT c.c1, c.c2, c.c3, c.c4
+FROM (
+  SELECT a.c1 AS c1, a.c2 AS c2, b.c3 AS c3, b.c4 AS c4
+  FROM
+  (
+    SELECT src1.key AS c1, src1.value AS c2
+    FROM duplicateRowData src1 WHERE src1.key > 100 and src1.key < 300
+  ) a
+  RIGHT OUTER JOIN
+  (
+    SELECT src2.key AS c3, src2.value AS c4
+    FROM duplicateRowData src2 WHERE src2.key > 200 and src2.key < 400
+  ) b
+  ON (a.c1 = b.c3)
+) c;
+
+-- full-outer join over two nested table expressions
+SELECT c.c1, c.c2, c.c3, c.c4
+FROM (
+ SELECT a.c1 AS c1, a.c2 AS c2, b.c3 AS c3, b.c4 AS c4
+ FROM
+ (
+   SELECT src1.key AS c1, src1.value AS c2
+   FROM duplicateRowData src1 WHERE src1.key > 100 and src1.key < 300
+ ) a
+ FULL OUTER JOIN
+ (
+   SELECT src2.key AS c3, src2.value AS c4
+   FROM duplicateRowData src2 WHERE src2.key > 200 and src2.key < 400
+ ) b
+ ON (a.c1 = b.c3)
+) c;
+
+-- full-outer join + left-outer join over nested table expressions
+SELECT c.c1, c.c2, c.c3, c.c4, c.c5, c.c6
+FROM (
+  SELECT a.c1 AS c1, a.c2 AS c2, b.c3 AS c3, b.c4 AS c4, c.c5 AS c5, c.c6 AS c6
+  FROM
+  (
+    SELECT src1.key AS c1, src1.value AS c2
+    FROM duplicateRowData src1 WHERE src1.key > 10 and src1.key < 150
+  ) a
+  FULL OUTER JOIN
+  (
+    SELECT src2.key AS c3, src2.value AS c4
+    FROM duplicateRowData src2 WHERE src2.key > 150 and src2.key < 300
+  ) b
+  ON (a.c1 = b.c3)
+  LEFT OUTER JOIN
+  (
+    SELECT src3.key AS c5, src3.value AS c6
+    FROM duplicateRowData src3 WHERE src3.key > 200 and src3.key < 400
+  ) c
+  ON (a.c1 = c.c5)
+) c;
+
+-- left-outer join + join condition + filter
+SELECT c.c1, c.c2, c.c3, c.c4
+FROM (
+ SELECT a.c1 AS c1, a.c2 AS c2, b.c3 AS c3, b.c4 AS c4
+ FROM
+ (
+   SELECT src1.key AS c1, src1.value AS c2
+   FROM duplicateRowData src1 WHERE src1.key > 100 and src1.key < 300
+ ) a
+ LEFT OUTER JOIN
+ (
+   SELECT src2.key AS c3, src2.value AS c4
+   FROM duplicateRowData src2 WHERE src2.key > 200 and src2.key < 400
+ ) b
+ ON (a.c1 = b.c3)
+) c
+where c.c3 IS NULL AND c.c1 IS NOT NULL;
+
+-- full outer join over Aggregate
+SELECT a.key, a.value, b.key, b.value
+FROM
+  (
+    SELECT src1.key as key, count(src1.value) AS value
+    FROM duplicateRowData src1 group by src1.key
+  ) a
+  FULL OUTER JOIN
+  (
+    SELECT src2.key as key, count(distinct(src2.value)) AS value
+    FROM nullData src2 group by src2.key
+  ) b
+ON (a.key = b.key);
+
+-- full outer join + multi distinct
+SELECT a.key, a.value, b.key, b.value1, b.value2
+FROM
+  (
+    SELECT src1.key as key, count(src1.value) AS value
+    FROM duplicateRowData src1 group by src1.key
+  ) a
+  FULL OUTER JOIN
+  (
+    SELECT src2.key as key, count(distinct(src2.value)) AS value1,
+      count(distinct(src2.key)) AS value2
+    FROM nullData src2 group by src2.key
+  ) b
+ON (a.key = b.key);
+
+-- inner join + right-outer join #1
+SELECT a.k1,a.v1,a.k2,a.v2,a.k3,a.v3
+FROM (
+  SELECT src1.key as k1, src1.value as v1, src2.key as k2, src2.value as v2 , src3.key as k3,
+    src3.value as v3
+  FROM duplicateRowData src1 JOIN duplicateRowData src2 ON (src1.key = src2.key AND src1.key < 200)
+    RIGHT OUTER JOIN duplicateRowData src3 ON (src1.key = src3.key AND src3.key < 300)
+  SORT BY k1,v1,k2,v2,k3,v3
+)a;
+
+-- inner join + right-outer join #2
+SELECT a.k1,a.v1,a.k2,a.v2,a.k3,a.v3
+FROM (
+  SELECT src1.key as k1, src1.value as v1, src2.key as k2, src2.value as v2 , src3.key as k3,
+    src3.value as v3
+  FROM duplicateRowData src1
+    JOIN duplicateRowData src2
+      ON (src1.key = src2.key AND src1.key < 200 AND src2.key < 100)
+    RIGHT OUTER JOIN duplicateRowData src3
+      ON (src1.key = src3.key AND src3.key < 300)
+  SORT BY k1,v1,k2,v2,k3,v3
+)a;
+
+-- left outer join + right outer join
+SELECT *
+FROM
+  duplicateRowData src1
+  LEFT OUTER JOIN duplicateRowData src2
+    ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+  RIGHT OUTER JOIN duplicateRowData src3
+    ON (src2.key = src3.key AND src3.key < 200)
+SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value;
+
+-- left outer + right outer
+SELECT * FROM duplicateRowData src1
+ LEFT OUTER JOIN duplicateRowData src2
+   ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ RIGHT OUTER JOIN duplicateRowData src3
+   ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value;
+
+-- right outer + right outer
+SELECT * FROM duplicateRowData src1
+ RIGHT OUTER JOIN duplicateRowData src2
+   ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ RIGHT OUTER JOIN duplicateRowData src3
+   ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value;
+
+-- left outer + left outer
+SELECT * FROM duplicateRowData src1
+ LEFT OUTER JOIN duplicateRowData src2
+   ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ LEFT OUTER JOIN duplicateRowData src3
+   ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value;
+
+-- right outer + left outer
+SELECT * FROM duplicateRowData src1
+ RIGHT OUTER JOIN duplicateRowData src2
+   ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ LEFT OUTER JOIN duplicateRowData src3
+   ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value;
+
+-- inner + left outer
+SELECT * FROM duplicateRowData src1
+ JOIN duplicateRowData src2 ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ LEFT OUTER JOIN duplicateRowData src3 ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value;
+
+-- inner + right outer
+SELECT * FROM duplicateRowData src1
+ JOIN duplicateRowData src2 ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ RIGHT OUTER JOIN duplicateRowData src3 ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value;
+
+-- left + inner outer
+SELECT * FROM duplicateRowData src1
+ LEFT OUTER JOIN duplicateRowData src2
+   ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ JOIN duplicateRowData src3
+   ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value;
+
+-- right + inner join
+SELECT * FROM duplicateRowData src1
+ RIGHT OUTER JOIN duplicateRowData src2
+   ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ JOIN duplicateRowData src3
+   ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value;
+
+-- left outer join with sorted by nested table expression
+FROM
+(SELECT duplicateRowData.* FROM duplicateRowData sort by key) x
+LEFT OUTER JOIN
+(SELECT nullData.* FROM nullData sort by value) Y
+ON (x.key = Y.key)
+select Y.key,Y.value;
+
+-- right outer join with sorted by nested table expression
+FROM
+(SELECT duplicateRowData.* FROM duplicateRowData sort by key) x
+RIGHT OUTER JOIN
+(SELECT nullData.* FROM nullData sort by value) Y
+ON (x.key = Y.key)
+select Y.key,Y.value;
+
+-- inner + left outer with sorted by nested table expression
+FROM
+(SELECT duplicateRowData.* FROM duplicateRowData sort by key) x
+JOIN
+(SELECT duplicateRowData.* FROM duplicateRowData sort by value) Y
+ON (x.key = Y.key)
+LEFT OUTER JOIN
+(SELECT duplicateRowData.* FROM duplicateRowData sort by value) Z
+ON (x.key = Z.key)
+select Y.key,Y.value;
+
+-- left + left outer with sorted by nested table expression
+FROM
+(SELECT nullData.* FROM nullData sort by key) x
+LEFT OUTER JOIN
+(SELECT duplicateRowData.* FROM duplicateRowData sort by value) Y
+ON (x.key = Y.key)
+LEFT OUTER JOIN
+(SELECT nullData.* FROM nullData sort by value) Z
+ON (x.key = Z.key)
+select Y.key,Y.value;
+
+-- left + right outer with sorted by nested table expression
+FROM
+(SELECT nullData.* FROM nullData sort by key) x
+LEFT OUTER JOIN
+(SELECT nullData.* FROM nullData sort by value) Y
+ON (x.key = Y.key)
+RIGHT OUTER JOIN
+(SELECT duplicateRowData.* FROM duplicateRowData sort by value) Z
+ON (x.key = Z.key)
+select Y.key,Y.value;
+
+-- right + right outer with sorted by nested table expression
+FROM
+(SELECT duplicateRowData.* FROM duplicateRowData sort by key) x
+RIGHT OUTER JOIN
+(SELECT nullData.* FROM nullData sort by value) Y
+ON (x.key = Y.key)
+RIGHT OUTER JOIN
+(SELECT duplicateRowData.* FROM duplicateRowData sort by value) Z
+ON (x.key = Z.key)
+select Y.key,Y.value;
+
+-- right outer + inner with sorted by nested table expression
+FROM
+(SELECT duplicateRowData.* FROM duplicateRowData sort by key) x
+RIGHT OUTER JOIN
+(SELECT nullData.* FROM nullData sort by value) Y
+ON (x.key = Y.key)
+JOIN
+(SELECT duplicateRowData.* FROM duplicateRowData sort by value) Z
+ON (x.key = Z.key)
+select Y.key,Y.value;
diff --git a/sql/core/src/test/resources/sql-tests/results/arithmetic.sql.out b/sql/core/src/test/resources/sql-tests/results/arithmetic.sql.out
index 6abe048af477..c1d3e6a898a5 100644
--- a/sql/core/src/test/resources/sql-tests/results/arithmetic.sql.out
+++ b/sql/core/src/test/resources/sql-tests/results/arithmetic.sql.out
@@ -35,7 +35,7 @@ struct<6.8:double>
 
 
 -- !query 4
-select -key, +key from testdata where key = 2
+select -key, +key from uniqueRowData where key = 2
 -- !query 4 schema
 struct<(- key):int,key:int>
 -- !query 4 output
@@ -43,7 +43,7 @@ struct<(- key):int,key:int>
 
 
 -- !query 5
-select -(key + 1), - key + 1, +(key + 5) from testdata where key = 1
+select -(key + 1), - key + 1, +(key + 5) from uniqueRowData where key = 1
 -- !query 5 schema
 struct<(- (key + 1)):int,((- key) + 1):int,(key + 5):int>
 -- !query 5 output
@@ -51,7 +51,7 @@ struct<(- (key + 1)):int,((- key) + 1):int,(key + 5):int>
 
 
 -- !query 6
-select -max(key), +max(key) from testdata
+select -max(key), +max(key) from uniqueRowData
 -- !query 6 schema
 struct<(- max(key)):int,max(key):int>
 -- !query 6 output
@@ -67,7 +67,7 @@ struct<(- -10):int>
 
 
 -- !query 8
-select + (-key) from testdata where key = 32
+select + (-key) from uniqueRowData where key = 32
 -- !query 8 schema
 struct<(- key):int>
 -- !query 8 output
@@ -75,7 +75,7 @@ struct<(- key):int>
 
 
 -- !query 9
-select - (+max(key)) from testdata
+select - (+max(key)) from uniqueRowData
 -- !query 9 schema
 struct<(- max(key)):int>
 -- !query 9 output
@@ -107,7 +107,7 @@ struct<100:int>
 
 
 -- !query 13
-select - - max(key) from testdata
+select - - max(key) from uniqueRowData
 -- !query 13 schema
 struct<(- (- max(key))):int>
 -- !query 13 output
@@ -115,7 +115,7 @@ struct<(- (- max(key))):int>
 
 
 -- !query 14
-select + - key from testdata where key = 33
+select + - key from uniqueRowData where key = 33
 -- !query 14 schema
 struct<(- key):int>
 -- !query 14 output
diff --git a/sql/core/src/test/resources/sql-tests/results/limit.sql.out b/sql/core/src/test/resources/sql-tests/results/limit.sql.out
index cb4e4d04810d..e3d1a8bc8717 100644
--- a/sql/core/src/test/resources/sql-tests/results/limit.sql.out
+++ b/sql/core/src/test/resources/sql-tests/results/limit.sql.out
@@ -3,7 +3,7 @@
 
 
 -- !query 0
-select * from testdata limit 2
+select * from uniqueRowData limit 2
 -- !query 0 schema
 struct<key:int,value:string>
 -- !query 0 output
@@ -30,7 +30,7 @@ struct<mapcol:map<int,string>>
 
 
 -- !query 3
-select * from testdata limit 2 + 1
+select * from uniqueRowData limit 2 + 1
 -- !query 3 schema
 struct<key:int,value:string>
 -- !query 3 output
@@ -40,7 +40,7 @@ struct<key:int,value:string>
 
 
 -- !query 4
-select * from testdata limit CAST(1 AS int)
+select * from uniqueRowData limit CAST(1 AS int)
 -- !query 4 schema
 struct<key:int,value:string>
 -- !query 4 output
@@ -48,7 +48,7 @@ struct<key:int,value:string>
 
 
 -- !query 5
-select * from testdata limit -1
+select * from uniqueRowData limit -1
 -- !query 5 schema
 struct<>
 -- !query 5 output
@@ -57,16 +57,16 @@ The limit expression must be equal to or greater than 0, but got -1;
 
 
 -- !query 6
-select * from testdata limit key > 3
+select * from uniqueRowData limit key > 3
 -- !query 6 schema
 struct<>
 -- !query 6 output
 org.apache.spark.sql.AnalysisException
-The limit expression must evaluate to a constant value, but got (testdata.`key` > 3);
+The limit expression must evaluate to a constant value, but got (uniquerowdata.`key` > 3);
 
 
 -- !query 7
-select * from testdata limit true
+select * from uniqueRowData limit true
 -- !query 7 schema
 struct<>
 -- !query 7 output
@@ -75,7 +75,7 @@ The limit expression must be integer type, but got boolean;
 
 
 -- !query 8
-select * from testdata limit 'a'
+select * from uniqueRowData limit 'a'
 -- !query 8 schema
 struct<>
 -- !query 8 output
diff --git a/sql/core/src/test/resources/sql-tests/results/outer-join.sql.out b/sql/core/src/test/resources/sql-tests/results/outer-join.sql.out
new file mode 100644
index 000000000000..d1f4eed68ecb
--- /dev/null
+++ b/sql/core/src/test/resources/sql-tests/results/outer-join.sql.out
@@ -0,0 +1,643 @@
+-- Automatically generated by SQLQueryTestSuite
+-- Number of queries: 32
+
+
+-- !query 0
+CREATE OR REPLACE TEMPORARY VIEW lowerCaseData AS SELECT * FROM VALUES
+(1, "a"),
+(2, "b"),
+(3, "c"),
+(4, "d")
+as lowerCaseData(n, l)
+-- !query 0 schema
+struct<>
+-- !query 0 output
+
+
+
+-- !query 1
+CREATE OR REPLACE TEMPORARY VIEW upperCaseData AS SELECT * FROM VALUES
+(1, "A"),
+(2, "B"),
+(3, "C"),
+(4, "D"),
+(5, "E"),
+(6, "F")
+as upperCaseData(N, L)
+-- !query 1 schema
+struct<>
+-- !query 1 output
+
+
+
+-- !query 2
+CREATE OR REPLACE TEMPORARY VIEW nullData AS SELECT * FROM VALUES
+(201, null),
+(86, "val_86"),
+(null, "val_null"),
+(165, "val_165"),
+(null, null),
+(330, "val_330"),
+(165, null)
+as nullData(key, value)
+-- !query 2 schema
+struct<>
+-- !query 2 output
+
+
+
+-- !query 3
+CREATE OR REPLACE TEMPORARY VIEW duplicateRowData AS SELECT * FROM VALUES
+(251, "val_251"),
+(86, "val_86"),
+(165, "val_165"),
+(330, "val_330"),
+(165, "val_165")
+as duplicateRowData(key, value)
+-- !query 3 schema
+struct<>
+-- !query 3 output
+
+
+
+-- !query 4
+SELECT * FROM
+  (SELECT * FROM upperCaseData WHERE N <= 4) leftTable FULL OUTER JOIN
+  (SELECT * FROM upperCaseData WHERE N >= 3) rightTable
+    ON leftTable.N = rightTable.N
+-- !query 4 schema
+struct<N:int,L:string,N:int,L:string>
+-- !query 4 output
+1	A	NULL	NULL
+2	B	NULL	NULL
+3	C	3	C
+4	D	4	D
+NULL	NULL	5	E
+NULL	NULL	6	F
+
+
+-- !query 5
+SELECT * FROM lowercasedata l RIGHT OUTER JOIN uppercasedata u ON l.n = u.N
+-- !query 5 schema
+struct<n:int,l:string,N:int,L:string>
+-- !query 5 output
+1	a	1	A
+2	b	2	B
+3	c	3	C
+4	d	4	D
+NULL	NULL	5	E
+NULL	NULL	6	F
+
+
+-- !query 6
+SELECT * FROM uppercasedata u LEFT OUTER JOIN lowercasedata l ON l.n = u.N
+-- !query 6 schema
+struct<N:int,L:string,n:int,l:string>
+-- !query 6 output
+1	A	1	a
+2	B	2	b
+3	C	3	c
+4	D	4	d
+5	E	NULL	NULL
+6	F	NULL	NULL
+
+
+-- !query 7
+SELECT c.c1, c.c2, c.c3, c.c4
+FROM (
+  SELECT a.c1 AS c1, a.c2 AS c2, b.c3 AS c3, b.c4 AS c4
+  FROM
+  (
+    SELECT src1.key AS c1, src1.value AS c2
+    FROM duplicateRowData src1 WHERE src1.key > 100 and src1.key < 300
+  ) a
+  LEFT OUTER JOIN
+  (
+    SELECT src2.key AS c3, src2.value AS c4
+    FROM duplicateRowData src2 WHERE src2.key > 200 and src2.key < 400
+  ) b
+  ON (a.c1 = b.c3)
+) c
+-- !query 7 schema
+struct<c1:int,c2:string,c3:int,c4:string>
+-- !query 7 output
+165	val_165	NULL	NULL
+165	val_165	NULL	NULL
+251	val_251	251	val_251
+
+
+-- !query 8
+SELECT c.c1, c.c2, c.c3, c.c4
+FROM (
+  SELECT a.c1 AS c1, a.c2 AS c2, b.c3 AS c3, b.c4 AS c4
+  FROM
+  (
+    SELECT src1.key AS c1, src1.value AS c2
+    FROM duplicateRowData src1 WHERE src1.key > 100 and src1.key < 300
+  ) a
+  RIGHT OUTER JOIN
+  (
+    SELECT src2.key AS c3, src2.value AS c4
+    FROM duplicateRowData src2 WHERE src2.key > 200 and src2.key < 400
+  ) b
+  ON (a.c1 = b.c3)
+) c
+-- !query 8 schema
+struct<c1:int,c2:string,c3:int,c4:string>
+-- !query 8 output
+251	val_251	251	val_251
+NULL	NULL	330	val_330
+
+
+-- !query 9
+SELECT c.c1, c.c2, c.c3, c.c4
+FROM (
+ SELECT a.c1 AS c1, a.c2 AS c2, b.c3 AS c3, b.c4 AS c4
+ FROM
+ (
+   SELECT src1.key AS c1, src1.value AS c2
+   FROM duplicateRowData src1 WHERE src1.key > 100 and src1.key < 300
+ ) a
+ FULL OUTER JOIN
+ (
+   SELECT src2.key AS c3, src2.value AS c4
+   FROM duplicateRowData src2 WHERE src2.key > 200 and src2.key < 400
+ ) b
+ ON (a.c1 = b.c3)
+) c
+-- !query 9 schema
+struct<c1:int,c2:string,c3:int,c4:string>
+-- !query 9 output
+165	val_165	NULL	NULL
+165	val_165	NULL	NULL
+251	val_251	251	val_251
+NULL	NULL	330	val_330
+
+
+-- !query 10
+SELECT c.c1, c.c2, c.c3, c.c4, c.c5, c.c6
+FROM (
+  SELECT a.c1 AS c1, a.c2 AS c2, b.c3 AS c3, b.c4 AS c4, c.c5 AS c5, c.c6 AS c6
+  FROM
+  (
+    SELECT src1.key AS c1, src1.value AS c2
+    FROM duplicateRowData src1 WHERE src1.key > 10 and src1.key < 150
+  ) a
+  FULL OUTER JOIN
+  (
+    SELECT src2.key AS c3, src2.value AS c4
+    FROM duplicateRowData src2 WHERE src2.key > 150 and src2.key < 300
+  ) b
+  ON (a.c1 = b.c3)
+  LEFT OUTER JOIN
+  (
+    SELECT src3.key AS c5, src3.value AS c6
+    FROM duplicateRowData src3 WHERE src3.key > 200 and src3.key < 400
+  ) c
+  ON (a.c1 = c.c5)
+) c
+-- !query 10 schema
+struct<c1:int,c2:string,c3:int,c4:string,c5:int,c6:string>
+-- !query 10 output
+86	val_86	NULL	NULL	NULL	NULL
+NULL	NULL	165	val_165	NULL	NULL
+NULL	NULL	165	val_165	NULL	NULL
+NULL	NULL	251	val_251	NULL	NULL
+
+
+-- !query 11
+SELECT c.c1, c.c2, c.c3, c.c4
+FROM (
+ SELECT a.c1 AS c1, a.c2 AS c2, b.c3 AS c3, b.c4 AS c4
+ FROM
+ (
+   SELECT src1.key AS c1, src1.value AS c2
+   FROM duplicateRowData src1 WHERE src1.key > 100 and src1.key < 300
+ ) a
+ LEFT OUTER JOIN
+ (
+   SELECT src2.key AS c3, src2.value AS c4
+   FROM duplicateRowData src2 WHERE src2.key > 200 and src2.key < 400
+ ) b
+ ON (a.c1 = b.c3)
+) c
+where c.c3 IS NULL AND c.c1 IS NOT NULL
+-- !query 11 schema
+struct<c1:int,c2:string,c3:int,c4:string>
+-- !query 11 output
+165	val_165	NULL	NULL
+165	val_165	NULL	NULL
+
+
+-- !query 12
+SELECT a.key, a.value, b.key, b.value
+FROM
+  (
+    SELECT src1.key as key, count(src1.value) AS value
+    FROM duplicateRowData src1 group by src1.key
+  ) a
+  FULL OUTER JOIN
+  (
+    SELECT src2.key as key, count(distinct(src2.value)) AS value
+    FROM nullData src2 group by src2.key
+  ) b
+ON (a.key = b.key)
+-- !query 12 schema
+struct<key:int,value:bigint,key:int,value:bigint>
+-- !query 12 output
+165	2	165	1
+251	1	NULL	NULL
+330	1	330	1
+86	1	86	1
+NULL	NULL	201	0
+NULL	NULL	NULL	1
+
+
+-- !query 13
+SELECT a.key, a.value, b.key, b.value1, b.value2
+FROM
+  (
+    SELECT src1.key as key, count(src1.value) AS value
+    FROM duplicateRowData src1 group by src1.key
+  ) a
+  FULL OUTER JOIN
+  (
+    SELECT src2.key as key, count(distinct(src2.value)) AS value1,
+      count(distinct(src2.key)) AS value2
+    FROM nullData src2 group by src2.key
+  ) b
+ON (a.key = b.key)
+-- !query 13 schema
+struct<key:int,value:bigint,key:int,value1:bigint,value2:bigint>
+-- !query 13 output
+165	2	165	1	1
+251	1	NULL	NULL	NULL
+330	1	330	1	1
+86	1	86	1	1
+NULL	NULL	201	0	1
+NULL	NULL	NULL	1	0
+
+
+-- !query 14
+SELECT a.k1,a.v1,a.k2,a.v2,a.k3,a.v3
+FROM (
+  SELECT src1.key as k1, src1.value as v1, src2.key as k2, src2.value as v2 , src3.key as k3,
+    src3.value as v3
+  FROM duplicateRowData src1 JOIN duplicateRowData src2 ON (src1.key = src2.key AND src1.key < 200)
+    RIGHT OUTER JOIN duplicateRowData src3 ON (src1.key = src3.key AND src3.key < 300)
+  SORT BY k1,v1,k2,v2,k3,v3
+)a
+-- !query 14 schema
+struct<k1:int,v1:string,k2:int,v2:string,k3:int,v3:string>
+-- !query 14 output
+165	val_165	165	val_165	165	val_165
+165	val_165	165	val_165	165	val_165
+165	val_165	165	val_165	165	val_165
+165	val_165	165	val_165	165	val_165
+165	val_165	165	val_165	165	val_165
+165	val_165	165	val_165	165	val_165
+165	val_165	165	val_165	165	val_165
+165	val_165	165	val_165	165	val_165
+86	val_86	86	val_86	86	val_86
+NULL	NULL	NULL	NULL	251	val_251
+NULL	NULL	NULL	NULL	330	val_330
+
+
+-- !query 15
+SELECT a.k1,a.v1,a.k2,a.v2,a.k3,a.v3
+FROM (
+  SELECT src1.key as k1, src1.value as v1, src2.key as k2, src2.value as v2 , src3.key as k3,
+    src3.value as v3
+  FROM duplicateRowData src1
+    JOIN duplicateRowData src2
+      ON (src1.key = src2.key AND src1.key < 200 AND src2.key < 100)
+    RIGHT OUTER JOIN duplicateRowData src3
+      ON (src1.key = src3.key AND src3.key < 300)
+  SORT BY k1,v1,k2,v2,k3,v3
+)a
+-- !query 15 schema
+struct<k1:int,v1:string,k2:int,v2:string,k3:int,v3:string>
+-- !query 15 output
+86	val_86	86	val_86	86	val_86
+NULL	NULL	NULL	NULL	165	val_165
+NULL	NULL	NULL	NULL	165	val_165
+NULL	NULL	NULL	NULL	251	val_251
+NULL	NULL	NULL	NULL	330	val_330
+
+
+-- !query 16
+SELECT *
+FROM
+  duplicateRowData src1
+  LEFT OUTER JOIN duplicateRowData src2
+    ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+  RIGHT OUTER JOIN duplicateRowData src3
+    ON (src2.key = src3.key AND src3.key < 200)
+SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value
+-- !query 16 schema
+struct<key:int,value:string,key:int,value:string,key:int,value:string>
+-- !query 16 output
+NULL	NULL	NULL	NULL	165	val_165
+NULL	NULL	NULL	NULL	165	val_165
+NULL	NULL	NULL	NULL	251	val_251
+NULL	NULL	NULL	NULL	330	val_330
+NULL	NULL	NULL	NULL	86	val_86
+
+
+-- !query 17
+SELECT * FROM duplicateRowData src1
+ LEFT OUTER JOIN duplicateRowData src2
+   ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ RIGHT OUTER JOIN duplicateRowData src3
+   ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value
+-- !query 17 schema
+struct<key:int,value:string,key:int,value:string,key:int,value:string>
+-- !query 17 output
+NULL	NULL	NULL	NULL	165	val_165
+NULL	NULL	NULL	NULL	165	val_165
+NULL	NULL	NULL	NULL	251	val_251
+NULL	NULL	NULL	NULL	330	val_330
+NULL	NULL	NULL	NULL	86	val_86
+
+
+-- !query 18
+SELECT * FROM duplicateRowData src1
+ RIGHT OUTER JOIN duplicateRowData src2
+   ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ RIGHT OUTER JOIN duplicateRowData src3
+   ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value
+-- !query 18 schema
+struct<key:int,value:string,key:int,value:string,key:int,value:string>
+-- !query 18 output
+NULL	NULL	165	val_165	165	val_165
+NULL	NULL	165	val_165	165	val_165
+NULL	NULL	165	val_165	165	val_165
+NULL	NULL	165	val_165	165	val_165
+NULL	NULL	86	val_86	86	val_86
+NULL	NULL	NULL	NULL	251	val_251
+NULL	NULL	NULL	NULL	330	val_330
+
+
+-- !query 19
+SELECT * FROM duplicateRowData src1
+ LEFT OUTER JOIN duplicateRowData src2
+   ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ LEFT OUTER JOIN duplicateRowData src3
+   ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value
+-- !query 19 schema
+struct<key:int,value:string,key:int,value:string,key:int,value:string>
+-- !query 19 output
+165	val_165	NULL	NULL	NULL	NULL
+165	val_165	NULL	NULL	NULL	NULL
+251	val_251	NULL	NULL	NULL	NULL
+330	val_330	NULL	NULL	NULL	NULL
+86	val_86	NULL	NULL	NULL	NULL
+
+
+-- !query 20
+SELECT * FROM duplicateRowData src1
+ RIGHT OUTER JOIN duplicateRowData src2
+   ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ LEFT OUTER JOIN duplicateRowData src3
+   ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value
+-- !query 20 schema
+struct<key:int,value:string,key:int,value:string,key:int,value:string>
+-- !query 20 output
+NULL	NULL	165	val_165	165	val_165
+NULL	NULL	165	val_165	165	val_165
+NULL	NULL	165	val_165	165	val_165
+NULL	NULL	165	val_165	165	val_165
+NULL	NULL	251	val_251	NULL	NULL
+NULL	NULL	330	val_330	NULL	NULL
+NULL	NULL	86	val_86	86	val_86
+
+
+-- !query 21
+SELECT * FROM duplicateRowData src1
+ JOIN duplicateRowData src2 ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ LEFT OUTER JOIN duplicateRowData src3 ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value
+-- !query 21 schema
+struct<key:int,value:string,key:int,value:string,key:int,value:string>
+-- !query 21 output
+
+
+
+-- !query 22
+SELECT * FROM duplicateRowData src1
+ JOIN duplicateRowData src2 ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ RIGHT OUTER JOIN duplicateRowData src3 ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value
+-- !query 22 schema
+struct<key:int,value:string,key:int,value:string,key:int,value:string>
+-- !query 22 output
+NULL	NULL	NULL	NULL	165	val_165
+NULL	NULL	NULL	NULL	165	val_165
+NULL	NULL	NULL	NULL	251	val_251
+NULL	NULL	NULL	NULL	330	val_330
+NULL	NULL	NULL	NULL	86	val_86
+
+
+-- !query 23
+SELECT * FROM duplicateRowData src1
+ LEFT OUTER JOIN duplicateRowData src2
+   ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ JOIN duplicateRowData src3
+   ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value
+-- !query 23 schema
+struct<key:int,value:string,key:int,value:string,key:int,value:string>
+-- !query 23 output
+
+
+
+-- !query 24
+SELECT * FROM duplicateRowData src1
+ RIGHT OUTER JOIN duplicateRowData src2
+   ON (src1.key = src2.key AND src1.key < 200 AND src2.key > 200)
+ JOIN duplicateRowData src3
+   ON (src2.key = src3.key AND src3.key < 200)
+ SORT BY src1.key, src1.value, src2.key, src2.value, src3.key, src3.value
+-- !query 24 schema
+struct<key:int,value:string,key:int,value:string,key:int,value:string>
+-- !query 24 output
+NULL	NULL	165	val_165	165	val_165
+NULL	NULL	165	val_165	165	val_165
+NULL	NULL	165	val_165	165	val_165
+NULL	NULL	165	val_165	165	val_165
+NULL	NULL	86	val_86	86	val_86
+
+
+-- !query 25
+FROM
+(SELECT duplicateRowData.* FROM duplicateRowData sort by key) x
+LEFT OUTER JOIN
+(SELECT nullData.* FROM nullData sort by value) Y
+ON (x.key = Y.key)
+select Y.key,Y.value
+-- !query 25 schema
+struct<key:int,value:string>
+-- !query 25 output
+165	NULL
+165	NULL
+165	val_165
+165	val_165
+330	val_330
+86	val_86
+NULL	NULL
+
+
+-- !query 26
+FROM
+(SELECT duplicateRowData.* FROM duplicateRowData sort by key) x
+RIGHT OUTER JOIN
+(SELECT nullData.* FROM nullData sort by value) Y
+ON (x.key = Y.key)
+select Y.key,Y.value
+-- !query 26 schema
+struct<key:int,value:string>
+-- !query 26 output
+165	NULL
+165	NULL
+165	val_165
+165	val_165
+201	NULL
+330	val_330
+86	val_86
+NULL	NULL
+NULL	val_null
+
+
+-- !query 27
+FROM
+(SELECT duplicateRowData.* FROM duplicateRowData sort by key) x
+JOIN
+(SELECT duplicateRowData.* FROM duplicateRowData sort by value) Y
+ON (x.key = Y.key)
+LEFT OUTER JOIN
+(SELECT duplicateRowData.* FROM duplicateRowData sort by value) Z
+ON (x.key = Z.key)
+select Y.key,Y.value
+-- !query 27 schema
+struct<key:int,value:string>
+-- !query 27 output
+165	val_165
+165	val_165
+165	val_165
+165	val_165
+165	val_165
+165	val_165
+165	val_165
+165	val_165
+251	val_251
+330	val_330
+86	val_86
+
+
+-- !query 28
+FROM
+(SELECT nullData.* FROM nullData sort by key) x
+LEFT OUTER JOIN
+(SELECT duplicateRowData.* FROM duplicateRowData sort by value) Y
+ON (x.key = Y.key)
+LEFT OUTER JOIN
+(SELECT nullData.* FROM nullData sort by value) Z
+ON (x.key = Z.key)
+select Y.key,Y.value
+-- !query 28 schema
+struct<key:int,value:string>
+-- !query 28 output
+165	val_165
+165	val_165
+165	val_165
+165	val_165
+165	val_165
+165	val_165
+165	val_165
+165	val_165
+330	val_330
+86	val_86
+NULL	NULL
+NULL	NULL
+NULL	NULL
+
+
+-- !query 29
+FROM
+(SELECT nullData.* FROM nullData sort by key) x
+LEFT OUTER JOIN
+(SELECT nullData.* FROM nullData sort by value) Y
+ON (x.key = Y.key)
+RIGHT OUTER JOIN
+(SELECT duplicateRowData.* FROM duplicateRowData sort by value) Z
+ON (x.key = Z.key)
+select Y.key,Y.value
+-- !query 29 schema
+struct<key:int,value:string>
+-- !query 29 output
+165	NULL
+165	NULL
+165	NULL
+165	NULL
+165	val_165
+165	val_165
+165	val_165
+165	val_165
+330	val_330
+86	val_86
+NULL	NULL
+
+
+-- !query 30
+FROM
+(SELECT duplicateRowData.* FROM duplicateRowData sort by key) x
+RIGHT OUTER JOIN
+(SELECT nullData.* FROM nullData sort by value) Y
+ON (x.key = Y.key)
+RIGHT OUTER JOIN
+(SELECT duplicateRowData.* FROM duplicateRowData sort by value) Z
+ON (x.key = Z.key)
+select Y.key,Y.value
+-- !query 30 schema
+struct<key:int,value:string>
+-- !query 30 output
+165	NULL
+165	NULL
+165	NULL
+165	NULL
+165	val_165
+165	val_165
+165	val_165
+165	val_165
+330	val_330
+86	val_86
+NULL	NULL
+
+
+-- !query 31
+FROM
+(SELECT duplicateRowData.* FROM duplicateRowData sort by key) x
+RIGHT OUTER JOIN
+(SELECT nullData.* FROM nullData sort by value) Y
+ON (x.key = Y.key)
+JOIN
+(SELECT duplicateRowData.* FROM duplicateRowData sort by value) Z
+ON (x.key = Z.key)
+select Y.key,Y.value
+-- !query 31 schema
+struct<key:int,value:string>
+-- !query 31 output
+165	NULL
+165	NULL
+165	NULL
+165	NULL
+165	val_165
+165	val_165
+165	val_165
+165	val_165
+330	val_330
+86	val_86
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
index eac266cba55b..edaaac569c4c 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
@@ -734,49 +734,6 @@ class SQLQuerySuite extends QueryTest with SharedSQLContext {
     }
   }
 
-  test("left outer join") {
-    withSQLConf(SQLConf.CASE_SENSITIVE.key -> "true") {
-      checkAnswer(
-        sql("SELECT * FROM uppercasedata LEFT OUTER JOIN lowercasedata ON n = N"),
-        Row(1, "A", 1, "a") ::
-          Row(2, "B", 2, "b") ::
-          Row(3, "C", 3, "c") ::
-          Row(4, "D", 4, "d") ::
-          Row(5, "E", null, null) ::
-          Row(6, "F", null, null) :: Nil)
-    }
-  }
-
-  test("right outer join") {
-    withSQLConf(SQLConf.CASE_SENSITIVE.key -> "true") {
-      checkAnswer(
-        sql("SELECT * FROM lowercasedata RIGHT OUTER JOIN uppercasedata ON n = N"),
-        Row(1, "a", 1, "A") ::
-          Row(2, "b", 2, "B") ::
-          Row(3, "c", 3, "C") ::
-          Row(4, "d", 4, "D") ::
-          Row(null, null, 5, "E") ::
-          Row(null, null, 6, "F") :: Nil)
-    }
-  }
-
-  test("full outer join") {
-    checkAnswer(
-      sql(
-        """
-          |SELECT * FROM
-          |  (SELECT * FROM upperCaseData WHERE N <= 4) leftTable FULL OUTER JOIN
-          |  (SELECT * FROM upperCaseData WHERE N >= 3) rightTable
-          |    ON leftTable.N = rightTable.N
-        """.stripMargin),
-      Row(1, "A", null, null) ::
-      Row(2, "B", null, null) ::
-      Row(3, "C", 3, "C") ::
-      Row (4, "D", 4, "D") ::
-      Row(null, null, 5, "E") ::
-      Row(null, null, 6, "F") :: Nil)
-  }
-
   test("SPARK-11111 null-safe join should not use cartesian product") {
     val df = sql("select count(*) from testData a join testData b on (a.key <=> b.key)")
     val cp = df.queryExecution.sparkPlan.collect {
@@ -808,23 +765,6 @@ class SQLQuerySuite extends QueryTest with SharedSQLContext {
       Row(2, "b", 2) :: Nil)
   }
 
-  test("mixed-case keywords") {
-    checkAnswer(
-      sql(
-        """
-          |SeleCT * from
-          |  (select * from upperCaseData WherE N <= 4) leftTable fuLL OUtER joiN
-          |  (sElEcT * FROM upperCaseData whERe N >= 3) rightTable
-          |    oN leftTable.N = rightTable.N
-        """.stripMargin),
-      Row(1, "A", null, null) ::
-      Row(2, "B", null, null) ::
-      Row(3, "C", 3, "C") ::
-      Row(4, "D", 4, "D") ::
-      Row(null, null, 5, "E") ::
-      Row(null, null, 6, "F") :: Nil)
-  }
-
   test("select with table name as qualifier") {
     checkAnswer(
       sql("SELECT testData.value FROM testData WHERE testData.key = 1"),
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/SQLQueryTestSuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/SQLQueryTestSuite.scala
index 55d5a56f1040..f1879a436b98 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/SQLQueryTestSuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/SQLQueryTestSuite.scala
@@ -243,12 +243,16 @@ class SQLQueryTestSuite extends QueryTest with SharedSQLContext {
   private def loadTestData(session: SparkSession): Unit = {
     import session.implicits._
 
-    (1 to 100).map(i => (i, i.toString)).toDF("key", "value").createOrReplaceTempView("testdata")
+    // A data set containing non-duplicate column values
+    (1 to 100).map(i => (i, i.toString)).toDF("key", "value")
+      .createOrReplaceTempView("uniqueRowData")
 
+    // A data set containing a complex data type: ARRAY
     ((Seq(1, 2, 3), Seq(Seq(1, 2, 3))) :: (Seq(2, 3, 4), Seq(Seq(2, 3, 4))) :: Nil)
       .toDF("arraycol", "nestedarraycol")
       .createOrReplaceTempView("arraydata")
 
+    // A data set containing a complex data type: MAP
     (Tuple1(Map(1 -> "a1", 2 -> "b1", 3 -> "c1", 4 -> "d1", 5 -> "e1")) ::
       Tuple1(Map(1 -> "a2", 2 -> "b2", 3 -> "c2", 4 -> "d2")) ::
       Tuple1(Map(1 -> "a3", 2 -> "b3", 3 -> "c3")) ::