Package org.apache.calcite.sql2rel

Interface SqlRexContext

All Known Implementing Classes:
SqlToRelConverter.Blackboard
public interface SqlRexContext
Contains the context necessary for a SqlRexConvertlet to convert a SqlNode expression into a RexNode.

  • Method Details

    • convertExpression

      RexNode convertExpression(SqlNode expr)
      Converts an expression from SqlNode to RexNode format.
      Parameters:
      expr - Expression to translate
      Returns:
      Converted expression

    • hasEmptyGroup

      boolean hasEmptyGroup()
      If the operator call occurs in an aggregate query, returns whether there are empty groups in the GROUP BY clause. For example, 
       SELECT count(*) FROM emp GROUP BY deptno, gender;            returns false
 SELECT count(*) FROM emp;                                    returns true
 SELECT count(*) FROM emp GROUP BY ROLLUP(deptno, gender);    returns true
      If the operator call occurs in window aggregate query, then returns false if the window is guaranteed to be non-empty, or true if the window might be empty.

      Returns false if the query is not an aggregate query.

      See Also:

    • getRexBuilder

      RexBuilder getRexBuilder()
      Returns the RexBuilder to use to create RexNode objects.

    • getSubQueryExpr

      RexRangeRef getSubQueryExpr(SqlCall call)
      Returns the expression used to access a given IN or EXISTS sub-query.
      Parameters:
      call - IN or EXISTS expression
      Returns:
      Expression used to access current row of sub-query

    • getTypeFactory

      RelDataTypeFactory getTypeFactory()
      Returns the type factory.

    • getInitializerExpressionFactory

      InitializerExpressionFactory getInitializerExpressionFactory()
      Returns the factory which supplies default values for INSERT, UPDATE, and NEW.

    • getValidator

      SqlValidator getValidator()
      Returns the validator.

    • convertLiteral

      RexNode convertLiteral(SqlLiteral literal)
      Converts a literal.