com.cloudera.impala.analysis.ExprSubstitutionMap Class Reference

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

Public Member Functions
	ExprSubstitutionMap ()
	ExprSubstitutionMap (List< Expr > lhs, List< Expr > rhs)
void	put (Expr lhsExpr, Expr rhsExpr)
Expr	get (Expr lhsExpr)
boolean	containsMappingFor (Expr lhsExpr)
void	substituteLhs (ExprSubstitutionMap lhsSmap, Analyzer analyzer)
List< Expr >	getLhs ()
List< Expr >	getRhs ()
int	size ()
String	debugString ()
void	clear ()

Static Public Member Functions
static ExprSubstitutionMap	compose (ExprSubstitutionMap f, ExprSubstitutionMap g, Analyzer analyzer)
static ExprSubstitutionMap	combine (ExprSubstitutionMap f, ExprSubstitutionMap g)

Private Member Functions
void	verify ()

Private Attributes
List< Expr >	lhs_
List< Expr >	rhs_

Static Private Attributes
static final Logger	LOG = LoggerFactory.getLogger(ExprSubstitutionMap.class)

Detailed Description

Map of expression substitutions: lhs[i] gets substituted with rhs[i]. To support expression substitution across query blocks, rhs exprs must already be analyzed when added to this map. Otherwise, analysis of a SlotRef may fail after substitution, e.g., because the table it refers to is in a different query block that is not visible. See Expr.substitute() and related functions for details on the actual substitution.

Definition at line 20 of file ExprSubstitutionMap.java.

Constructor & Destructor Documentation

com.cloudera.impala.analysis.ExprSubstitutionMap.ExprSubstitutionMap ( )

inline

Definition at line 26 of file ExprSubstitutionMap.java.

Referenced by com.cloudera.impala.analysis.ExprSubstitutionMap.combine(), and com.cloudera.impala.analysis.ExprSubstitutionMap.compose().

com.cloudera.impala.analysis.ExprSubstitutionMap.ExprSubstitutionMap ( List< Expr >  lhs, List< Expr >  rhs  )

inline

Definition at line 30 of file ExprSubstitutionMap.java.

References com.cloudera.impala.analysis.ExprSubstitutionMap.lhs_, and com.cloudera.impala.analysis.ExprSubstitutionMap.rhs_.

Member Function Documentation

void com.cloudera.impala.analysis.ExprSubstitutionMap.clear ( )

inline

Definition at line 150 of file ExprSubstitutionMap.java.

static ExprSubstitutionMap com.cloudera.impala.analysis.ExprSubstitutionMap.combine ( ExprSubstitutionMap  f, ExprSubstitutionMap  g  )

inlinestatic

Returns the union of two substitution maps. Always returns a non-null map.

Definition at line 101 of file ExprSubstitutionMap.java.

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

static ExprSubstitutionMap com.cloudera.impala.analysis.ExprSubstitutionMap.compose ( ExprSubstitutionMap  f, ExprSubstitutionMap  g, Analyzer  analyzer  )

inlinestatic

Return a map which is equivalent to applying f followed by g, i.e., g(f()). Always returns a non-null map.

Definition at line 67 of file ExprSubstitutionMap.java.

References com.cloudera.impala.analysis.ExprSubstitutionMap.ExprSubstitutionMap(), and com.cloudera.impala.analysis.ExprSubstitutionMap.lhs_.

boolean com.cloudera.impala.analysis.ExprSubstitutionMap.containsMappingFor ( Expr  lhsExpr )

inline

Returns true if the smap contains a mapping for lhsExpr.

Definition at line 58 of file ExprSubstitutionMap.java.

Referenced by com.cloudera.impala.analysis.UnionStmt.createMetadata().

String com.cloudera.impala.analysis.ExprSubstitutionMap.debugString ( )

inline

Definition at line 124 of file ExprSubstitutionMap.java.

References com.cloudera.impala.analysis.ExprSubstitutionMap.rhs_.

Referenced by com.cloudera.impala.analysis.AnalyticInfo.debugString().

Expr com.cloudera.impala.analysis.ExprSubstitutionMap.get ( Expr  lhsExpr )

inline

Returns the expr mapped to lhsExpr or null if no mapping to lhsExpr exists.

Definition at line 48 of file ExprSubstitutionMap.java.

References com.cloudera.impala.analysis.ExprSubstitutionMap.lhs_.

List<Expr> com.cloudera.impala.analysis.ExprSubstitutionMap.getLhs ( )

inline

Definition at line 119 of file ExprSubstitutionMap.java.

References com.cloudera.impala.analysis.ExprSubstitutionMap.lhs_.

List<Expr> com.cloudera.impala.analysis.ExprSubstitutionMap.getRhs ( )

inline

Definition at line 120 of file ExprSubstitutionMap.java.

References com.cloudera.impala.analysis.ExprSubstitutionMap.rhs_.

void com.cloudera.impala.analysis.ExprSubstitutionMap.put ( Expr  lhsExpr, Expr  rhsExpr  )

inline

Add an expr mapping. The rhsExpr must be analyzed to support correct substitution across query blocks. It is not required that the lhsExpr is analyzed.

Definition at line 39 of file ExprSubstitutionMap.java.

int com.cloudera.impala.analysis.ExprSubstitutionMap.size ( )

inline

Definition at line 122 of file ExprSubstitutionMap.java.

void com.cloudera.impala.analysis.ExprSubstitutionMap.substituteLhs ( ExprSubstitutionMap  lhsSmap, Analyzer  analyzer  )

inline

Definition at line 115 of file ExprSubstitutionMap.java.

References com.cloudera.impala.analysis.ExprSubstitutionMap.lhs_.

void com.cloudera.impala.analysis.ExprSubstitutionMap.verify ( )

inlineprivate

Verifies the internal state of this smap: Checks that the lhs_ has no duplicates, and that all rhs exprs are analyzed.

Definition at line 138 of file ExprSubstitutionMap.java.

References com.cloudera.impala.analysis.ExprSubstitutionMap.lhs_.

Member Data Documentation

List<Expr> com.cloudera.impala.analysis.ExprSubstitutionMap.lhs_

private

Definition at line 23 of file ExprSubstitutionMap.java.

Referenced by com.cloudera.impala.analysis.ExprSubstitutionMap.compose(), com.cloudera.impala.analysis.ExprSubstitutionMap.ExprSubstitutionMap(), com.cloudera.impala.analysis.ExprSubstitutionMap.get(), com.cloudera.impala.analysis.ExprSubstitutionMap.getLhs(), com.cloudera.impala.analysis.ExprSubstitutionMap.substituteLhs(), and com.cloudera.impala.analysis.ExprSubstitutionMap.verify().

final Logger com.cloudera.impala.analysis.ExprSubstitutionMap.LOG = LoggerFactory.getLogger(ExprSubstitutionMap.class)

staticprivate

Definition at line 21 of file ExprSubstitutionMap.java.

List<Expr> com.cloudera.impala.analysis.ExprSubstitutionMap.rhs_

private

Definition at line 24 of file ExprSubstitutionMap.java.

Referenced by com.cloudera.impala.analysis.ExprSubstitutionMap.debugString(), com.cloudera.impala.analysis.ExprSubstitutionMap.ExprSubstitutionMap(), and com.cloudera.impala.analysis.ExprSubstitutionMap.getRhs().

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The documentation for this class was generated from the following file:

• fe/src/main/java/com/cloudera/impala/analysis/ExprSubstitutionMap.java