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 and Description
RelToSqlConverterUtil()

Method Summary

Modifier and Type	Method and 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	unparseHiveTrim(SqlWriter writer, SqlCall call, int leftPrec, int rightPrec) For usage of TRIM, LTRIM and RTRIM in Hive, see Hive UDF usage.

Methods inherited from class java.lang.Object

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

Constructor Detail

RelToSqlConverterUtil

public RelToSqlConverterUtil()

Method Detail

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.

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.