Collaboration diagram for com.cloudera.impala.analysis.LimitElement:

Public Member Functions
	LimitElement (Expr limitExpr, Expr offsetExpr)

Expr	getLimitExpr ()

Expr	getOffsetExpr ()

long	getLimit ()

boolean	hasLimit ()

long	getOffset ()

String	toSql ()

void	analyze (Analyzer analyzer) throws AnalysisException

LimitElement	clone ()

Protected Member Functions
	LimitElement (LimitElement other)

Static Private Member Functions
static long	evalIntegerExpr (Analyzer analyzer, Expr expr, String name) throws AnalysisException

Private Attributes
final Expr	limitExpr_

final Expr	offsetExpr_

long	limit_

long	offset_

boolean	isAnalyzed_

Detailed Description

Combination of limit and offset expressions.

Definition at line 26 of file LimitElement.java.

Constructor & Destructor Documentation

com.cloudera.impala.analysis.LimitElement.LimitElement	(	Expr	limitExpr,
		Expr	offsetExpr
	)

inline

Constructs the LimitElement.

Parameters

limitExpr	The limit expression. May be null if there is no LIMIT clause.
offsetExpr	The offset expression. May be null if there is no OFFSET clause.

Definition at line 38 of file LimitElement.java.

References com.cloudera.impala.analysis.LimitElement.isAnalyzed_, com.cloudera.impala.analysis.LimitElement.limit_, and com.cloudera.impala.analysis.LimitElement.offset_.

Referenced by com.cloudera.impala.analysis.LimitElement.clone().

com.cloudera.impala.analysis.LimitElement.LimitElement ( LimitElement other )

inlineprotected

Copy c'tor used in clone().

Definition at line 49 of file LimitElement.java.

References com.cloudera.impala.analysis.Expr.clone(), com.cloudera.impala.analysis.LimitElement.isAnalyzed_, com.cloudera.impala.analysis.LimitElement.limit_, com.cloudera.impala.analysis.LimitElement.limitExpr_, com.cloudera.impala.analysis.LimitElement.offset_, and com.cloudera.impala.analysis.LimitElement.offsetExpr_.

Member Function Documentation

void com.cloudera.impala.analysis.LimitElement.analyze ( Analyzer analyzer ) throws AnalysisException

inline

Definition at line 98 of file LimitElement.java.

References com.cloudera.impala.analysis.LimitElement.evalIntegerExpr(), com.cloudera.impala.analysis.Expr.getType(), com.cloudera.impala.analysis.LimitElement.isAnalyzed_, com.cloudera.impala.analysis.Expr.isConstant(), com.cloudera.impala.analysis.LimitElement.limit_, com.cloudera.impala.analysis.LimitElement.limitExpr_, com.cloudera.impala.analysis.LimitElement.offset_, com.cloudera.impala.analysis.LimitElement.offsetExpr_, and com.cloudera.impala.analysis.Expr.toSql().

LimitElement com.cloudera.impala.analysis.LimitElement.clone ( )

inline

Definition at line 165 of file LimitElement.java.

References com.cloudera.impala.analysis.LimitElement.LimitElement().

Referenced by com.cloudera.impala.analysis.ValuesStmt.clone(), com.cloudera.impala.analysis.UnionStmt.clone(), and com.cloudera.impala.analysis.SelectStmt.clone().

static long com.cloudera.impala.analysis.LimitElement.evalIntegerExpr	(	Analyzer	analyzer,
		Expr	expr,
		String	name
	)		throws AnalysisException

inlinestaticprivate

Evaluations an expression to a non-zero integral value, returned as a long. Throws if the expression cannot be evaluated, if the value evaluates to null, or if the result is negative. The 'name' parameter is used in exception messages, e.g. "LIMIT expression evaluates to NULL".

Definition at line 136 of file LimitElement.java.

References impala.name.

Referenced by com.cloudera.impala.analysis.LimitElement.analyze().

long com.cloudera.impala.analysis.LimitElement.getLimit ( )

inline

Returns the integer limit, evaluated from the limit expression. Must call analyze() first. If no limit was set, then -1 is returned.

Definition at line 64 of file LimitElement.java.

References com.cloudera.impala.analysis.LimitElement.isAnalyzed_, and com.cloudera.impala.analysis.LimitElement.limit_.

Referenced by com.cloudera.impala.analysis.SelectStmt.returnsSingleRow().

Expr com.cloudera.impala.analysis.LimitElement.getLimitExpr ( )

inline

Definition at line 57 of file LimitElement.java.

References com.cloudera.impala.analysis.LimitElement.limitExpr_.

long com.cloudera.impala.analysis.LimitElement.getOffset ( )

inline

Returns the integer offset, evaluated from the offset expression. Must call analyze() first. If no offsetExpr exists, then 0 (the default offset) is returned.

Definition at line 78 of file LimitElement.java.

References com.cloudera.impala.analysis.LimitElement.isAnalyzed_, and com.cloudera.impala.analysis.LimitElement.offset_.

Expr com.cloudera.impala.analysis.LimitElement.getOffsetExpr ( )

inline

Definition at line 58 of file LimitElement.java.

References com.cloudera.impala.analysis.LimitElement.offsetExpr_.

Referenced by com.cloudera.impala.analysis.QueryStmt.analyzeLimit().

boolean com.cloudera.impala.analysis.LimitElement.hasLimit ( )

inline

Definition at line 69 of file LimitElement.java.

References com.cloudera.impala.analysis.LimitElement.isAnalyzed_, and com.cloudera.impala.analysis.LimitElement.limit_.

String com.cloudera.impala.analysis.LimitElement.toSql ( )