Package org.apache.calcite.sql.util

Interface SqlVisitor<R>

Type Parameters:

R - Return type

All Known Implementing Classes:

SqlBasicVisitor, SqlScopedShuttle, SqlShuttle, SqlToRelConverter.Blackboard, SqlToRelConverter.SqlIdentifierFinder, SqlValidatorUtil.DeepCopier, Util.OverFinder

public interface SqlVisitor<R>

Visitor class, follows the visitor pattern.

The type parameter R is the return type of each visit() method. If the methods do not need to return a value, use Void.

See Also:

• SqlBasicVisitor
• SqlNode.accept(SqlVisitor)
• SqlOperator.acceptCall(org.apache.calcite.sql.util.SqlVisitor<R>, org.apache.calcite.sql.SqlCall)

Method Summary

Modifier and Type	Method	Description
R	visit(SqlCall call)	Visits a call to a SqlOperator.
R	visit(SqlDataTypeSpec type)	Visits a datatype specification.
R	visit(SqlDynamicParam param)	Visits a dynamic parameter.
R	visit(SqlIdentifier id)	Visits an identifier.
R	visit(SqlIntervalQualifier intervalQualifier)	Visits an interval qualifier.
R	visit(SqlLiteral literal)	Visits a literal.
R	visit(SqlNodeList nodeList)	Visits a list of SqlNode objects.
default void	visitAll(List<SqlNode> selectList)	Visits all nodes in a list.
default R	visitNode(SqlNode n)	Asks a SqlNode to accept this visitor.

Method Details

visit

R visit(SqlLiteral literal)

Visits a literal.

Parameters:

literal - Literal

See Also:

• SqlLiteral.accept(SqlVisitor)

visit

R visit(SqlCall call)

Visits a call to a SqlOperator.

Parameters:

call - Call

See Also:

• SqlCall.accept(SqlVisitor)

visit

R visit(SqlNodeList nodeList)

Visits a list of SqlNode objects.

Parameters:

nodeList - list of nodes

See Also:

• SqlNodeList.accept(SqlVisitor)

visit

R visit(SqlIdentifier id)

Visits an identifier.

Parameters:

id - identifier

See Also:

• SqlIdentifier.accept(SqlVisitor)

visit

R visit(SqlDataTypeSpec type)

Visits a datatype specification.

Parameters:

type - datatype specification

See Also:

• SqlDataTypeSpec.accept(SqlVisitor)

visit

R visit(SqlDynamicParam param)

Visits a dynamic parameter.

Parameters:

param - Dynamic parameter

See Also:

• SqlDynamicParam.accept(SqlVisitor)

visit

R visit(SqlIntervalQualifier intervalQualifier)

Visits an interval qualifier.

Parameters:

intervalQualifier - Interval qualifier

See Also:

• SqlIntervalQualifier.accept(SqlVisitor)

visitNode

default R visitNode(SqlNode n)

Asks a SqlNode to accept this visitor.

visitAll

default void visitAll(List<SqlNode> selectList)

Visits all nodes in a list.