io.crate.analyze.relations

Class QuerySplitter

java.lang.Object

io.crate.analyze.relations.QuerySplitter

public class QuerySplitter
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
QuerySplitter()

Method Summary

Modifier and Type	Method and Description
static java.util.Map<java.util.Set<QualifiedName>,Symbol>	split(Symbol symbol) Splits a (function) symbol on AND based on relation occurrences of RelationColumn into multiple symbols.

Methods inherited from class java.lang.Object

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

Constructor Detail

QuerySplitter

public QuerySplitter()

Method Detail

split

public static java.util.Map<java.util.Set<QualifiedName>,Symbol> split(Symbol symbol)

Splits a (function) symbol on AND based on relation occurrences of RelationColumn into multiple symbols.

This does not work with Field

Examples:

Splittable down to single relation:

     t1.x = 30 and ty2.y = 20

     Output:

     set(t1) -> t1.x = 30
     set(t2) -> t2.y = 20
 

Pairs of two relations:

     t1.x = t2.x and t2.x = t3.x

     Output:

     set(t1, t2) -> t1.x = t2.x
     set(t2, t3) -> t2.x = t3.x
 

Mixed:

     t1.x = 30 and t2.x = t3.x

     Output:

     set(t1)      -> t1.x = 30
     set(t2, t3)  -> t2.x = t3.x