org.apache.calcite.sql.validate

Class SqlValidatorImpl.NavigationReplacer

java.lang.Object

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

org.apache.calcite.sql.util.SqlShuttle

org.apache.calcite.sql.validate.SqlValidatorImpl.NavigationModifier

org.apache.calcite.sql.validate.SqlValidatorImpl.NavigationReplacer

All Implemented Interfaces:

SqlVisitor<SqlNode>

Enclosing class:

SqlValidatorImpl

private static class SqlValidatorImpl.NavigationReplacer
extends SqlValidatorImpl.NavigationModifier

Shuttle that replaces A as A.price > PREV(B.price) with PREV(A.price, 0) > LAST(B.price, 0).

Replacing A.price with PREV(A.price, 0) makes the implementation of RexVisitor.visitPatternFieldRef(RexPatternFieldRef) more unified. Otherwise, it's difficult to implement this method. If it returns the specified field, then the navigation such as PREV(A.price, 1) becomes impossible; if not, then comparisons such as A.price > PREV(A.price, 1) become meaningless.

Nested Class Summary

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

SqlShuttle.CallCopyingArgHandler

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

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

Field Summary

Fields

Modifier and Type	Field and Description
private String	alpha

Constructor Summary

Constructors

Constructor and Description
NavigationReplacer(String alpha)

Method Summary

Modifier and Type	Method and Description
SqlNode	visit(SqlCall call) Visits a call to a SqlOperator.
SqlNode	visit(SqlIdentifier id) Visits an identifier.

Methods inherited from class org.apache.calcite.sql.validate.SqlValidatorImpl.NavigationModifier

go

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

visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Field Detail

alpha

private final String alpha

Constructor Detail

NavigationReplacer

NavigationReplacer(String alpha)

Method Detail

visit

public SqlNode visit(SqlCall call)

Description copied from interface: SqlVisitor

Visits a call to a SqlOperator.

Specified by:

visit in interface SqlVisitor<SqlNode>

Overrides:

visit in class SqlShuttle

Parameters:

call - Call

See Also:

SqlCall.accept(SqlVisitor)

visit

public SqlNode visit(SqlIdentifier id)

Description copied from interface: SqlVisitor

Visits an identifier.

Specified by:

visit in interface SqlVisitor<SqlNode>

Overrides:

visit in class SqlShuttle

Parameters:

id - identifier

See Also:

SqlIdentifier.accept(SqlVisitor)