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 Summary

Methods

Modifier and Type	Method and Description
RexNode	convertExpression(SqlNode expr) Converts an expression from SqlNode to RexNode format.
RexNode	convertLiteral(SqlLiteral literal) Converts a literal.
DefaultValueFactory	getDefaultValueFactory() Returns the factory which supplies default values for INSERT, UPDATE, and NEW.
int	getGroupCount() If the operator call occurs in an aggregate query, returns the number of columns in the GROUP BY clause.
RexBuilder	getRexBuilder() Returns the RexBuilder to use to create RexNode objects.
RexRangeRef	getSubqueryExpr(SqlCall call) Returns the expression used to access a given IN or EXISTS sub-query.
RelDataTypeFactory	getTypeFactory() Returns the type factory.
SqlValidator	getValidator() Returns the validator.

Method Detail

convertExpression

RexNode convertExpression(SqlNode expr)

Converts an expression from SqlNode to RexNode format.

Parameters:

expr - Expression to translate

Returns:

Converted expression

getGroupCount

int getGroupCount()

If the operator call occurs in an aggregate query, returns the number of columns in the GROUP BY clause. For example, for "SELECT count(*) FROM emp GROUP BY deptno, gender", returns 2. If the operator call occurs in window aggregate query, then returns 1 if the window is guaranteed to be non-empty, or 0 if the window might be empty.

Returns 0 if the query is implicitly "GROUP BY ()" because of an aggregate expression. For example, "SELECT sum(sal) FROM emp".

Returns -1 if the query is not an aggregate query.

Returns:

0 if the query is implicitly GROUP BY (), -1 if the query is not and aggregate query

See Also:

SqlOperatorBinding.getGroupCount()

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.

getDefaultValueFactory

DefaultValueFactory getDefaultValueFactory()

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.