org.apache.beam.sdk.extensions.sql.zetasql

Class SqlIfNullOperatorRewriter

java.lang.Object

org.apache.beam.sdk.extensions.sql.zetasql.SqlIfNullOperatorRewriter

All Implemented Interfaces:

SqlOperatorRewriter

public class SqlIfNullOperatorRewriter
extends java.lang.Object
implements SqlOperatorRewriter

Rewrites IFNULL calls as CASE ($case_no_value) calls.

Turns IFNULL(expr, null_result) into:

CASE
   WHEN expr IS NULL THEN null_result
   ELSE expr
   END

Constructor Summary

Constructors

Constructor and Description
SqlIfNullOperatorRewriter()

Method Summary

Modifier and Type	Method and Description
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rex.RexNode	apply(org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rex.RexBuilder rexBuilder, java.util.List<org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rex.RexNode> operands) Create and return a new RexNode that represents a call to this operator with the specified operands.

Methods inherited from class java.lang.Object

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

Constructor Detail

SqlIfNullOperatorRewriter

public SqlIfNullOperatorRewriter()

Method Detail

apply

public org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rex.RexNode apply(org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rex.RexBuilder rexBuilder,
                                                                                   java.util.List<org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rex.RexNode> operands)

Description copied from interface: SqlOperatorRewriter

Create and return a new RexNode that represents a call to this operator with the specified operands.

Specified by:

apply in interface SqlOperatorRewriter

Parameters:

rexBuilder - A RexBuilder instance to use for creating new RexNodes

operands - The original list of RexNode operands passed to this operator call

Returns:

The created RexNode