Package org.apache.druid.segment.filter.cnf

Class CalciteCnfHelper

java.lang.Object

org.apache.druid.segment.filter.cnf.CalciteCnfHelper

public class CalciteCnfHelper
extends Object

All functions in this class were basically adopted from Apache Calcite and modified to use them in Druid. See https://github.com/apache/calcite/blob/branch-1.21/core/src/main/java/org/apache/calcite/rex/RexUtil.java#L1615 for original implementation.

Method Summary

Modifier and Type	Method	Description
static List<Filter>	conjunctions(Filter rexPredicate)	Returns a condition decomposed by AND.
static void	decomposeConjunction(Filter rexPredicate, List<Filter> rexList)	Decomposes a predicate into a list of expressions that are AND'ed together.
static Filter	pull(Filter rex)

Methods inherited from class java.lang.Object

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

Method Details

pull

public static Filter pull(Filter rex)

conjunctions

public static List<Filter> conjunctions(Filter rexPredicate)

Returns a condition decomposed by AND.

For example, conjunctions(TRUE) returns the empty list; conjunctions(FALSE) returns list {FALSE}.

decomposeConjunction

public static void decomposeConjunction(Filter rexPredicate,
 List<Filter> rexList)

Decomposes a predicate into a list of expressions that are AND'ed together.

Parameters:

rexPredicate - predicate to be analyzed

rexList - list of decomposed RexNodes