io.crate.analyze.expressions

Class ExpressionAnalyzer

java.lang.Object

io.crate.analyze.expressions.ExpressionAnalyzer

Direct Known Subclasses:

ValuesAwareExpressionAnalyzer

public class ExpressionAnalyzer
extends java.lang.Object

This Analyzer can be used to convert Expression from the SQL AST into symbols.

In order to resolve QualifiedName or SubscriptExpressions it will use the fieldResolver given in the constructor and generate a relationOutput for the matching Relation.

Field Summary

Fields

Modifier and Type	Field and Description
protected io.crate.analyze.expressions.ExpressionAnalyzer.InnerExpressionAnalyzer	innerAnalyzer

Constructor Summary

Constructors

Constructor and Description
ExpressionAnalyzer(AnalysisMetaData analysisMetaData, ParameterContext parameterContext, FieldProvider fieldProvider, FieldResolver fieldResolver)
ExpressionAnalyzer(Functions functions, ReferenceResolver<? extends Input<?>> referenceResolver, ParameterContext parameterContext, FieldProvider<?> fieldProvider, FieldResolver fieldResolver)

Method Summary

Methods

Modifier and Type	Method and Description
Symbol	convert(Expression expression, ExpressionAnalysisContext expressionAnalysisContext) Converts an expression into a symbol.
protected Symbol	convertFunctionCall(FunctionCall node, ExpressionAnalysisContext context)
WhereClause	generateWhereClause(com.google.common.base.Optional<Expression> whereExpression, ExpressionAnalysisContext context)
protected static java.lang.String	getQuotedSubscriptLiteral(java.lang.String nodeName)
java.lang.Integer	integerFromExpression(com.google.common.base.Optional<Expression> expression)
Symbol	normalize(Symbol symbol) Use to normalize a symbol.
Literal	normalizeInputForType(Symbol inputValue, DataType dataType) normalize and validate the given value according to the given DataType
void	resolveWritableFields(boolean value)

Methods inherited from class java.lang.Object

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

Field Detail

innerAnalyzer

protected io.crate.analyze.expressions.ExpressionAnalyzer.InnerExpressionAnalyzer innerAnalyzer

Constructor Detail

ExpressionAnalyzer

public ExpressionAnalyzer(Functions functions,
                  ReferenceResolver<? extends Input<?>> referenceResolver,
                  ParameterContext parameterContext,
                  FieldProvider<?> fieldProvider,
                  @Nullable
                  FieldResolver fieldResolver)

ExpressionAnalyzer

public ExpressionAnalyzer(AnalysisMetaData analysisMetaData,
                  ParameterContext parameterContext,
                  FieldProvider fieldProvider,
                  @Nullable
                  FieldResolver fieldResolver)

Method Detail

integerFromExpression

@Nullable
public java.lang.Integer integerFromExpression(com.google.common.base.Optional<Expression> expression)

normalize

public Symbol normalize(Symbol symbol)

Use to normalize a symbol. (For example to normalize a function that contains only literals to a literal)

convert

public Symbol convert(Expression expression,
             ExpressionAnalysisContext expressionAnalysisContext)

Converts an expression into a symbol.

Expressions like QualifiedName that reference a column are resolved using the fieldResolver that were passed to the constructor.

Some information (like resolved function symbols) are written onto the given expressionAnalysisContext

generateWhereClause

public WhereClause generateWhereClause(com.google.common.base.Optional<Expression> whereExpression,
                              ExpressionAnalysisContext context)

normalizeInputForType

public Literal normalizeInputForType(Symbol inputValue,
                            DataType dataType)

normalize and validate the given value according to the given DataType

Parameters:

inputValue - any Symbol that evaluates to a Literal or Parameter

dataType - the type to convert this input to

Returns:

a Literal of type dataType

convertFunctionCall

protected Symbol convertFunctionCall(FunctionCall node,
                         ExpressionAnalysisContext context)

resolveWritableFields

public void resolveWritableFields(boolean value)

getQuotedSubscriptLiteral

@Nullable
protected static java.lang.String getQuotedSubscriptLiteral(java.lang.String nodeName)