io.crate.analyze

Class GeneratedColumnExpander

java.lang.Object

io.crate.analyze.GeneratedColumnExpander

public final class GeneratedColumnExpander
extends java.lang.Object

Method Summary

Modifier and Type	Method and Description
static Symbol	maybeExpand(Symbol symbol, java.util.List<GeneratedReference> generatedCols, java.util.List<Reference> expansionCandidates)

Methods inherited from class java.lang.Object

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

Method Detail

maybeExpand

public static Symbol maybeExpand(Symbol symbol,
                                 java.util.List<GeneratedReference> generatedCols,
                                 java.util.List<Reference> expansionCandidates)

Returns:

symbol as is or rewritten to have generated columns expanded.

     example for an expansion:

     generatedCols:       [day as date_trunc('day', ts)]
     expansionCandidates: [day]

     input:   ts > $1
     output:  ts > $1 and day > date_trunc('day', ts)