[FLINK-16384][table][sql-client] Improve implementation of 'SHOW CREATE TABLE' statement.

This commit tries to
1. resolve the conflicts
2. revert the changes made on old planner
3. apply spotless formatting
4. fix DDL missing `TEMPORARY` keyword for temporary table
5. display table's full object path as catalog.db.table
6. support displaying the expanded query for view
7. add view test in CatalogTableITCase, and adapt sql client test to the new test framework
8. adapt docs

This closes apache#13011

Author: LadyForest

docs/dev/table/hive/hive_dialect.md

@@ -87,7 +87,6 @@
     "org.apache.flink.sql.parser.dql.SqlShowFunctions"
     "org.apache.flink.sql.parser.dql.SqlShowModules"
     "org.apache.flink.sql.parser.dql.SqlShowTables"
-    "org.apache.flink.sql.parser.dql.SqlShowCreateTable"
     "org.apache.flink.sql.parser.dql.SqlShowPartitions"
     "org.apache.flink.sql.parser.dql.SqlRichDescribeTable"
     "org.apache.flink.sql.parser.dql.SqlRichExplain"
@@ -531,7 +530,6 @@
     "SqlAlterDatabase()"
     "SqlDescribeDatabase()"
     "SqlShowTables()"
-    "SqlShowCreateTable()"
     "SqlRichDescribeTable()"
     "SqlShowFunctions()"
     "SqlAlterTable()"

docs/dev/table/hive/hive_dialect.zh.md

@@ -252,22 +252,6 @@ SqlShowTables SqlShowTables() :
     }
 }
 
-/**
-* Parse a "Show Create Table" query command.
-*/
-SqlShowCreateTable  SqlShowCreateTable() :
-{
-    SqlIdentifier tableName;
-    SqlParserPos pos;
-}
-{
-    <SHOW> <CREATE> <TABLE> { pos = getPos();}
-    tableName = CompoundIdentifier()
-    {
-        return new SqlShowCreateTable(pos, tableName);
-    }
-}
-
 /**
  * Here we add Rich in className to distinguish from calcite's original SqlDescribeTable.
  */

docs/dev/table/sql/show.md

@@ -111,12 +111,6 @@ public void testShowTables() {
         sql("show tables").ok("SHOW TABLES");
     }
 
-    @Test
-	public void testShowCreateTable() {
-		sql("show create table tbl").ok("SHOW CREATE TABLE `TBL`");
-		sql("show create table catalog1.db1.tbl").ok("SHOW CREATE TABLE `CATALOG1`.`DB1`.`TBL`");
-	}
-
     @Test
     public void testDescribeTable() {
         // TODO: support describe partition and columns

docs/dev/table/sql/show.zh.md

@@ -39,8 +39,6 @@
 import org.apache.flink.sql.parser.dql.SqlRichDescribeTable;
 import org.apache.flink.sql.parser.dql.SqlRichExplain;
 import org.apache.flink.sql.parser.dql.SqlShowCatalogs;
-import org.apache.flink.sql.parser.dql.SqlShowCreateTable;
-import org.apache.flink.sql.parser.dql.SqlShowCreateTable;
 import org.apache.flink.sql.parser.dql.SqlShowCurrentCatalog;
 import org.apache.flink.sql.parser.dql.SqlShowCurrentDatabase;
 import org.apache.flink.sql.parser.dql.SqlShowDatabases;
@@ -73,8 +71,6 @@
 import org.apache.flink.table.operations.Operation;
 import org.apache.flink.table.operations.PlannerQueryOperation;
 import org.apache.flink.table.operations.ShowCatalogsOperation;
-import org.apache.flink.table.operations.ShowCreateTableOperation;
-import org.apache.flink.table.operations.ShowCreateTableOperation;
 import org.apache.flink.table.operations.ShowCurrentCatalogOperation;
 import org.apache.flink.table.operations.ShowCurrentDatabaseOperation;
 import org.apache.flink.table.operations.ShowDatabasesOperation;
@@ -184,9 +180,7 @@ public static Optional<Operation> convert(
             return Optional.of(converter.convertAlterTable((SqlAlterTable) validated));
         } else if (validated instanceof SqlShowTables) {
             return Optional.of(converter.convertShowTables((SqlShowTables) validated));
-        } else if (validated instanceof SqlShowCreateTable) {
-			return Optional.of(converter.convertShowCreateTable((SqlShowCreateTable) validated));
-		} else if (validated instanceof SqlCreateView) {
+        } else if (validated instanceof SqlCreateView) {
             return Optional.of(converter.convertCreateView((SqlCreateView) validated));
         } else if (validated instanceof SqlDropView) {
             return Optional.of(converter.convertDropView((SqlDropView) validated));
@@ -577,14 +571,7 @@ private Operation convertShowTables(SqlShowTables sqlShowTables) {
         return new ShowTablesOperation();
     }
 
-    /** Convert SHOW CREATE TABLE statement. */
-	private Operation convertShowCreateTable(SqlShowCreateTable sqlShowCreateTable) {
-		UnresolvedIdentifier unresolvedIdentifier = UnresolvedIdentifier.of(sqlShowCreateTable.getFullTableName());
-		ObjectIdentifier identifier = catalogManager.qualifyIdentifier(unresolvedIdentifier);
-		return new ShowCreateTableOperation(identifier);
-	}
-
-	/** Convert SHOW FUNCTIONS statement. */
+    /** Convert SHOW FUNCTIONS statement. */
     private Operation convertShowFunctions(SqlShowFunctions sqlShowFunctions) {
         return new ShowFunctionsOperation(
                 sqlShowFunctions.requireUser() ? FunctionScope.USER : FunctionScope.ALL);