org.apache.hudi.expression

Class PartialBindVisitor

java.lang.Object

org.apache.hudi.expression.BindVisitor

org.apache.hudi.expression.PartialBindVisitor

All Implemented Interfaces:

ExpressionVisitor<Expression>

public class PartialBindVisitor
extends BindVisitor

Will try to bind all references, and convert unresolved references to AlwaysTrue. e.g. `year=2023 AND day=12`, if year and day both are provided to `recordType`, then the expression won't change, if day is not provided, the expression will be transformed to `year=2023 AND True`, which will be optimized to `year=2023`.

Field Summary

Fields inherited from class org.apache.hudi.expression.BindVisitor

caseSensitive, recordType

Constructor Summary

Constructors

Constructor and Description
PartialBindVisitor(Types.RecordType recordType, boolean caseSensitive)

Method Summary

Modifier and Type	Method and Description
Expression	visitNameReference(NameReference attribute) If the attribute cannot find from the schema, directly return null, visitPredicate will handle it.
Expression	visitPredicate(Predicate predicate) If an expression is null after accept method, which means it cannot be bounded from schema, we'll directly return Predicates.TrueExpression.

Methods inherited from class org.apache.hudi.expression.BindVisitor

alwaysFalse, alwaysTrue, visitAnd, visitBoundReference, visitLiteral, visitOr

Methods inherited from class java.lang.Object

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

Constructor Detail

PartialBindVisitor

public PartialBindVisitor(Types.RecordType recordType,
                          boolean caseSensitive)

Method Detail

visitNameReference

public Expression visitNameReference(NameReference attribute)

If the attribute cannot find from the schema, directly return null, visitPredicate will handle it.

Specified by:

visitNameReference in interface ExpressionVisitor<Expression>

Overrides:

visitNameReference in class BindVisitor

visitPredicate

public Expression visitPredicate(Predicate predicate)

If an expression is null after accept method, which means it cannot be bounded from schema, we'll directly return Predicates.TrueExpression.

Specified by:

visitPredicate in interface ExpressionVisitor<Expression>

Overrides:

visitPredicate in class BindVisitor