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[SPARK-27931][SQL] Accept "true", "yes", "1", "false", "no", "0", and unique prefixes as input and trim input for the boolean data type. #25458

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[SPARK-27931][SQL] Accept "true", "yes", "1", "false", "no", "0", and unique prefixes as input and trim input for the boolean data type. #25458

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7d61642
[SPARK-27931][SQL] Accept 'on' and 'off' as input and trim input for …
Aug 15, 2019
933fe86
[SPARK-27931][SQL] Unique prefixes of strings are also accepted for t…
Aug 16, 2019
a5aec9f
Trim string whitespace so it should be true
Aug 16, 2019
9e9aac3
Generated spark golden files.
Aug 16, 2019
dacd46b
add a comment: "true", "yes", "1", "false", "no", "0", and unique pre…
Aug 27, 2019
abe9a84
[SPARK-27931][SQL] add a "FAlse" test case and remove the redundant s…
Aug 30, 2019
2ea551c
[SPARK-27931][SQL] add a negative test case for "o"
Aug 30, 2019
b787483
removed "[SPARK-27931] Trim the string when cast string type to boole…
Aug 30, 2019
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12 changes: 8 additions & 4 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/StringUtils.scala
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Expand Up @@ -65,12 +65,16 @@ object StringUtils extends Logging {
"(?s)" + out.result() // (?s) enables dotall mode, causing "." to match new lines
}

private[this] val trueStrings = Set("t", "true", "y", "yes", "1").map(UTF8String.fromString)
private[this] val falseStrings = Set("f", "false", "n", "no", "0").map(UTF8String.fromString)
// "true", "yes", "1", "false", "no", "0", and unique prefixes of these strings are accepted.
private[this] val trueStrings =
Set("true", "tru", "tr", "t", "yes", "ye", "y", "on", "1").map(UTF8String.fromString)

private[this] val falseStrings =
Set("false", "fals", "fal", "fa", "f", "no", "n", "off", "of", "0").map(UTF8String.fromString)

// scalastyle:off caselocale
def isTrueString(s: UTF8String): Boolean = trueStrings.contains(s.toLowerCase)
def isFalseString(s: UTF8String): Boolean = falseStrings.contains(s.toLowerCase)
def isTrueString(s: UTF8String): Boolean = trueStrings.contains(s.toLowerCase.trim())
def isFalseString(s: UTF8String): Boolean = falseStrings.contains(s.toLowerCase.trim())
// scalastyle:on caselocale

/**
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24 changes: 19 additions & 5 deletions sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CastSuite.scala
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Expand Up @@ -819,20 +819,34 @@ class CastSuite extends SparkFunSuite with ExpressionEvalHelper {
}

test("cast string to boolean") {
checkCast("t", true)
checkCast("true", true)
checkCast("tru", true)
checkCast("tr", true)
checkCast("t", true)
checkCast("tRUe", true)
checkCast("y", true)
checkCast(" tRue ", true)
checkCast(" tRu ", true)
checkCast("yes", true)
checkCast("ye", true)
checkCast("y", true)
checkCast("1", true)
checkCast("on", true)

checkCast("f", false)
checkCast("false", false)
checkCast("FAlsE", false)
checkCast("n", false)
checkCast("fals", false)
checkCast("fal", false)
checkCast("fa", false)
checkCast("f", false)
checkCast(" fAlse ", false)
checkCast(" fAls ", false)
checkCast(" FAlsE ", false)
checkCast("no", false)
checkCast("n", false)
checkCast("0", false)
checkCast("off", false)
checkCast("of", false)
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@younggyuchun, just for doubly sure, did you double check the behaviours against PostgreSQL?

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@HyukjinKwon Here it is:
image

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This is not documented: https://www.postgresql.org/docs/devel/datatype-boolean.html

Postgres may support of for history reasons, I don't think we have to follow it.

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@cloud-fan @dongjoon-hyun @HyukjinKwon
This build accepts several unique prefixes for the boolean data type. For example, tru, tr, ye, fals, fal, fa and of, which are not documented. Do we want to not to accept these prefixes?

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@cloud-fan . It's a documented feature in that document. We had better support it.

Unique prefixes of these strings are also accepted, for example t or n. Leading or trailing whitespace is ignored, and case does not matter.

cc @gatorsmile

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@dongjoon-hyun dongjoon-hyun Aug 30, 2019 •
edited
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BTW, @younggyuchun . Please add a negative test case.
o is not supported because it's not unique. It's a common prefix for on and off.
It should be null.

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Seems okay to me

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SGTM


checkEvaluation(cast("o", BooleanType), null)
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@dongjoon-hyun
Add a negative test for "o"

checkEvaluation(cast("abc", BooleanType), null)
checkEvaluation(cast("", BooleanType), null)
}
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5 changes: 1 addition & 4 deletions sql/core/src/test/resources/sql-tests/inputs/pgSQL/boolean.sql
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Expand Up @@ -22,7 +22,6 @@ SELECT false AS `false`;

SELECT boolean('t') AS true;

-- [SPARK-27931] Trim the string when cast string type to boolean type
SELECT boolean(' f ') AS `false`;

SELECT boolean('true') AS true;
Expand All @@ -49,12 +48,10 @@ SELECT boolean('no') AS `false`;
-- [SPARK-27923] PostgreSQL does not accept 'nay' but Spark SQL accepts it and sets it to NULL
SELECT boolean('nay') AS error;

-- [SPARK-27931] Accept 'on' and 'off' as input for boolean data type
SELECT boolean('on') AS true;

SELECT boolean('off') AS `false`;

-- [SPARK-27931] Accept unique prefixes thereof
SELECT boolean('of') AS `false`;

-- [SPARK-27923] PostgreSQL does not accept 'o' but Spark SQL accepts it and sets it to NULL
Expand Down Expand Up @@ -101,7 +98,7 @@ SELECT boolean('f') <= boolean('t') AS true;

-- explicit casts to/from text
SELECT boolean(string('TrUe')) AS true, boolean(string('fAlse')) AS `false`;
-- [SPARK-27931] Trim the string when cast to boolean type

SELECT boolean(string(' true ')) AS true,
boolean(string(' FALSE')) AS `false`;
SELECT string(boolean(true)) AS true, string(boolean(false)) AS `false`;
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10 changes: 5 additions & 5 deletions sql/core/src/test/resources/sql-tests/results/pgSQL/boolean.sql.out
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Expand Up @@ -39,7 +39,7 @@ SELECT boolean(' f ') AS `false`
-- !query 4 schema
struct<false:boolean>
-- !query 4 output
NULL
false
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plz remove the comments, too:

spark/sql/core/src/test/resources/sql-tests/inputs/pgSQL/boolean.sql

Line 25 in d502c80

-- [SPARK-27931] Trim the string when cast string type to boolean type

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I found the four places to remove.

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done Thank you @maropu



-- !query 5
Expand Down Expand Up @@ -127,23 +127,23 @@ SELECT boolean('on') AS true
-- !query 15 schema
struct<true:boolean>
-- !query 15 output
NULL
true


-- !query 16
SELECT boolean('off') AS `false`
-- !query 16 schema
struct<false:boolean>
-- !query 16 output
NULL
false


-- !query 17
SELECT boolean('of') AS `false`
-- !query 17 schema
struct<false:boolean>
-- !query 17 output
NULL
false


-- !query 18
Expand Down Expand Up @@ -296,7 +296,7 @@ SELECT boolean(string(' true ')) AS true,
-- !query 36 schema
struct<true:boolean,false:boolean>
-- !query 36 output
NULL NULL
true false


-- !query 37
Expand Down