org.apache.calcite.rex

Interface RexExecutor

All Known Subinterfaces:

RelOptPlanner.Executor

All Known Implementing Classes:

RexExecutorImpl

public interface RexExecutor

Can reduce expressions, writing a literal for each into a list.

Method Summary

Modifier and Type	Method and Description
void	reduce(RexBuilder rexBuilder, List<RexNode> constExps, List<RexNode> reducedValues) Reduces expressions, and writes their results into reducedValues.

Method Detail

reduce

void reduce(RexBuilder rexBuilder,
            List<RexNode> constExps,
            List<RexNode> reducedValues)

Reduces expressions, and writes their results into reducedValues.

If an expression cannot be reduced, writes the original expression. For example, CAST('abc' AS INTEGER) gives an error when executed, so the executor ignores the error and writes the original expression.

Parameters:

rexBuilder - Rex builder

constExps - Expressions to be reduced

reducedValues - List to which reduced expressions are appended