Package org.apache.calcite.util

Class RelToSqlConverterUtil

java.lang.Object

org.apache.calcite.util.RelToSqlConverterUtil

public abstract class RelToSqlConverterUtil
extends Object

Utilities used by multiple dialect for RelToSql conversion.

Constructor Summary

Constructors

Constructor	Description
RelToSqlConverterUtil()

Method Summary

Modifier and Type	Method	Description
static SqlCharStringLiteral	createRegexPatternLiteral(SqlNode call, SqlLiteral trimFlag)	Creates regex pattern based on the TRIM flag.
static SqlSpecialOperator	specialOperatorByName(String opName)	Returns a SqlSpecialOperator with given operator name, mainly used for unparse override.
static void	unparseBoolLiteralToCondition(SqlWriter writer, boolean value)	Writes TRUE/FALSE or 1 = 1/ 1 < > 1 for certain.
static void	unparseHiveTrim(SqlWriter writer, SqlCall call, int leftPrec, int rightPrec)	For usage of TRIM, LTRIM and RTRIM in Hive, see Hive UDF usage.
static void	unparseSparkArrayAndMap(SqlWriter writer, SqlCall call, int leftPrec, int rightPrec)	Unparses Array and Map value constructor.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

RelToSqlConverterUtil

public RelToSqlConverterUtil()

Method Details

unparseHiveTrim

public static void unparseHiveTrim(SqlWriter writer,
 SqlCall call,
 int leftPrec,
 int rightPrec)

For usage of TRIM, LTRIM and RTRIM in Hive, see Hive UDF usage.

unparseSparkArrayAndMap

public static void unparseSparkArrayAndMap(SqlWriter writer,
 SqlCall call,
 int leftPrec,
 int rightPrec)

Unparses Array and Map value constructor.

For example :

 SELECT ARRAY[1, 2, 3] → SELECT ARRAY (1, 2, 3)
 SELECT MAP['k1', 'v1', 'k2', 'v2'] → SELECT MAP ('k1', 'v1', 'k2', 'v2')
 

Parameters:

writer - writer

call - the call

createRegexPatternLiteral

public static SqlCharStringLiteral createRegexPatternLiteral(SqlNode call,
 SqlLiteral trimFlag)

Creates regex pattern based on the TRIM flag.

Parameters:

call - SqlCall contains the values that need to be trimmed

trimFlag - the trimFlag, either BOTH, LEADING or TRAILING

Returns:

the regex pattern of the character to be trimmed

specialOperatorByName

public static SqlSpecialOperator specialOperatorByName(String opName)

Returns a SqlSpecialOperator with given operator name, mainly used for unparse override.

unparseBoolLiteralToCondition

public static void unparseBoolLiteralToCondition(SqlWriter writer,
 boolean value)

Writes TRUE/FALSE or 1 = 1/ 1 < > 1 for certain.

Parameters:

writer - current SqlWriter object

value - boolean value to be unparsed.