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 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.