org.teiid.query.sql.symbol

Interface Expression

All Superinterfaces:

Cloneable, LanguageObject

All Known Subinterfaces:

DerivedExpression

All Known Implementing Classes:

AbstractCaseExpression, AbstractCompareCriteria, AbstractSetCriteria, AggregateSymbol, AliasSymbol, Array, AtomicCriteria, BetweenCriteria, CaseExpression, CompareCriteria, CompoundCriteria, Constant, Criteria, DependentSetCriteria, ElementSymbol, ExceptionExpression, ExistsCriteria, ExpressionCriteria, ExpressionSymbol, Function, ImmutableCompareCriteria, IsDistinctCriteria, IsNullCriteria, JSONObject, LogicalCriteria, MatchCriteria, MultipleElementSymbol, NotCriteria, PredicateCriteria, QueryString, Reference, ScalarSubquery, SearchedCaseExpression, SetCriteria, SubqueryCompareCriteria, SubquerySetCriteria, TextLine, WindowFunction, XMLCast, XMLElement, XMLExists, XMLForest, XMLParse, XMLQuery, XMLSerialize

public interface Expression
extends LanguageObject

This is the interface for an expression in a SQL string. Expressions can be of several types (see subclasses), but all expressions have a type. These types are used for type checking.

Nested Class Summary

Nested classes/interfaces inherited from interface org.teiid.query.sql.LanguageObject

LanguageObject.Util

Method Summary

Modifier and Type	Method and Description
Class<?>	getType() Get the return type of this expression.

Methods inherited from interface org.teiid.query.sql.LanguageObject

acceptVisitor, clone

Method Detail

getType

Class<?> getType()

Get the return type of this expression.

Returns:

Java class may be null prior to being resolved