org.apache.calcite.sql.validate

Class AggFinder

java.lang.Object

org.apache.calcite.sql.util.SqlBasicVisitor<Void>

org.apache.calcite.sql.validate.AggVisitor

org.apache.calcite.sql.validate.AggFinder

All Implemented Interfaces:

SqlVisitor<Void>

class AggFinder
extends AggVisitor

Visitor that looks for an aggregate function inside a tree of SqlNode objects and throws Util.FoundOne when it finds one.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) static class	AggFinder.AggIterable Iterates over all aggregates.

Nested classes/interfaces inherited from class org.apache.calcite.sql.util.SqlBasicVisitor

SqlBasicVisitor.ArgHandler<R>, SqlBasicVisitor.ArgHandlerImpl<R>

Field Summary

Fields inherited from class org.apache.calcite.sql.validate.AggVisitor

aggregate, delegate, group, opTab, over

Constructor Summary

Constructors

Constructor and Description
AggFinder(SqlOperatorTable opTab, boolean over, boolean aggregate, boolean group, AggFinder delegate) Creates an AggFinder.

Method Summary

Modifier and Type	Method and Description
SqlCall	findAgg(List<SqlNode> nodes)
SqlCall	findAgg(SqlNode node) Finds an aggregate.
(package private) Iterable<SqlCall>	findAll(Iterable<SqlNode> nodes) Creates a copy of this finder that has the same parameters as this, then returns the list of all aggregates found.
protected Void	found(SqlCall call)

Methods inherited from class org.apache.calcite.sql.validate.AggVisitor

visit

Methods inherited from class org.apache.calcite.sql.util.SqlBasicVisitor

visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Constructor Detail

AggFinder

AggFinder(SqlOperatorTable opTab,
          boolean over,
          boolean aggregate,
          boolean group,
          AggFinder delegate)

Creates an AggFinder.

Parameters:

opTab - Operator table

over - Whether to find windowed function calls agg(x) OVER windowSpec

aggregate - Whether to find non-windowed aggregate calls

group - Whether to find group functions (e.g. TUMBLE)

delegate - Finder to which to delegate when processing the arguments

Method Detail

findAgg

public SqlCall findAgg(SqlNode node)

Finds an aggregate.

Parameters:

node - Parse tree to search

Returns:

First aggregate function in parse tree, or null if not found

findAgg

public SqlCall findAgg(List<SqlNode> nodes)

found

protected Void found(SqlCall call)

Specified by:

found in class AggVisitor

findAll

Iterable<SqlCall> findAll(Iterable<SqlNode> nodes)

Creates a copy of this finder that has the same parameters as this, then returns the list of all aggregates found.