org.apache.calcite.sql

Class SqlSplittableAggFunction.Sum0Splitter

java.lang.Object

org.apache.calcite.sql.SqlSplittableAggFunction.AbstractSumSplitter

org.apache.calcite.sql.SqlSplittableAggFunction.Sum0Splitter

All Implemented Interfaces:

SqlSplittableAggFunction

Enclosing interface:

SqlSplittableAggFunction

public static class SqlSplittableAggFunction.Sum0Splitter
extends SqlSplittableAggFunction.AbstractSumSplitter

Splitting strategy for SUM0 function.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.calcite.sql.SqlSplittableAggFunction

SqlSplittableAggFunction.AbstractSumSplitter, SqlSplittableAggFunction.CountSplitter, SqlSplittableAggFunction.Registry<E>, SqlSplittableAggFunction.SelfSplitter, SqlSplittableAggFunction.Sum0Splitter, SqlSplittableAggFunction.SumSplitter

Field Summary

Fields

Modifier and Type	Field and Description
static SqlSplittableAggFunction.Sum0Splitter	INSTANCE

Constructor Summary

Constructors

Constructor and Description
Sum0Splitter()

Method Summary

Modifier and Type	Method and Description
SqlAggFunction	getMergeAggFunctionOfTopSplit()
RexNode	singleton(RexBuilder rexBuilder, RelDataType inputRowType, AggregateCall aggregateCall) Generates an expression for the value of the aggregate function when applied to a single row.

Methods inherited from class org.apache.calcite.sql.SqlSplittableAggFunction.AbstractSumSplitter

merge, other, split, topSplit

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final SqlSplittableAggFunction.Sum0Splitter INSTANCE

Constructor Detail

Sum0Splitter

public Sum0Splitter()

Method Detail

getMergeAggFunctionOfTopSplit

public SqlAggFunction getMergeAggFunctionOfTopSplit()

Specified by:

getMergeAggFunctionOfTopSplit in class SqlSplittableAggFunction.AbstractSumSplitter

singleton

public RexNode singleton(RexBuilder rexBuilder,
                         RelDataType inputRowType,
                         AggregateCall aggregateCall)

Description copied from interface: SqlSplittableAggFunction

Generates an expression for the value of the aggregate function when applied to a single row.

For example, if there is one row:

• SUM(x) is x
• MIN(x) is x
• MAX(x) is x
• COUNT(x) is CASE WHEN x IS NOT NULL THEN 1 ELSE 0 END 1 which can be simplified to 1 if x is never null
• COUNT(*) is 1

Specified by:

singleton in interface SqlSplittableAggFunction

Overrides:

singleton in class SqlSplittableAggFunction.AbstractSumSplitter

Parameters:

rexBuilder - Rex builder

inputRowType - Input row type

aggregateCall - Aggregate call

Returns:

Expression for single row