org.apache.hadoop.hive.ql.optimizer.calcite.translator

Class RexNodeConverter

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.calcite.translator.RexNodeConverter

public class RexNodeConverter
extends Object

Class that contains logic to translate Hive expressions (ExprNodeDesc) into Calcite expressions (RexNode).

Constructor Summary

Constructors

Constructor and Description
RexNodeConverter(org.apache.calcite.rex.RexBuilder rexBuilder, org.apache.calcite.rel.type.RelDataTypeFactory typeFactory) Constructor used by HiveRexExecutorImpl.

Method Summary

Modifier and Type	Method and Description
static List<org.apache.calcite.rex.RexNode>	adjustCaseBranchTypes(List<org.apache.calcite.rex.RexNode> nodes, org.apache.calcite.rel.type.RelDataType retType, org.apache.calcite.rex.RexBuilder rexBuilder) Adds explicit casts if Calcite's type system could not resolve the CASE branches to a common type.
protected org.apache.calcite.rex.RexNode	convert(ExprNodeConstantDesc literal)
org.apache.calcite.rex.RexNode	convert(ExprNodeDesc expr)
static org.apache.calcite.rex.RexNode	handleExplicitCast(GenericUDF udf, org.apache.calcite.rel.type.RelDataType returnType, List<org.apache.calcite.rex.RexNode> childRexNodeLst, org.apache.calcite.rex.RexBuilder rexBuilder)
static List<org.apache.calcite.rex.RexNode>	rewriteBetweenChildren(List<org.apache.calcite.rex.RexNode> childRexNodeLst, org.apache.calcite.rex.RexBuilder rexBuilder)
static List<org.apache.calcite.rex.RexNode>	rewriteCaseChildren(String funcText, List<org.apache.calcite.rex.RexNode> childRexNodeLst, org.apache.calcite.rex.RexBuilder rexBuilder)
static List<org.apache.calcite.rex.RexNode>	rewriteCoalesceChildren(List<org.apache.calcite.rex.RexNode> childRexNodeLst, org.apache.calcite.rex.RexBuilder rexBuilder)
static List<org.apache.calcite.rex.RexNode>	rewriteExtractDateChildren(org.apache.calcite.sql.SqlOperator op, List<org.apache.calcite.rex.RexNode> childRexNodeLst, org.apache.calcite.rex.RexBuilder rexBuilder)
static List<org.apache.calcite.rex.RexNode>	rewriteFloorDateChildren(org.apache.calcite.sql.SqlOperator op, List<org.apache.calcite.rex.RexNode> childRexNodeLst, org.apache.calcite.rex.RexBuilder rexBuilder)
static List<org.apache.calcite.rex.RexNode>	rewriteInClauseChildren(org.apache.calcite.sql.SqlOperator op, List<org.apache.calcite.rex.RexNode> childRexNodeLst, org.apache.calcite.rex.RexBuilder rexBuilder)
static List<org.apache.calcite.rex.RexNode>	rewriteToDateChildren(List<org.apache.calcite.rex.RexNode> childRexNodeLst, org.apache.calcite.rex.RexBuilder rexBuilder)
static List<org.apache.calcite.rex.RexNode>	transformInToOrOperands(List<org.apache.calcite.rex.RexNode> operands, org.apache.calcite.rex.RexBuilder rexBuilder) The method tries to rewrite an the operands of an IN function call into the operands for an OR function call.

Methods inherited from class java.lang.Object

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

Constructor Detail

RexNodeConverter

public RexNodeConverter(org.apache.calcite.rex.RexBuilder rexBuilder,
                        org.apache.calcite.rel.type.RelDataTypeFactory typeFactory)

Constructor used by HiveRexExecutorImpl.

Method Detail

convert

public org.apache.calcite.rex.RexNode convert(ExprNodeDesc expr)
                                       throws SemanticException

Throws:

SemanticException

handleExplicitCast

public static org.apache.calcite.rex.RexNode handleExplicitCast(GenericUDF udf,
                                                                org.apache.calcite.rel.type.RelDataType returnType,
                                                                List<org.apache.calcite.rex.RexNode> childRexNodeLst,
                                                                org.apache.calcite.rex.RexBuilder rexBuilder)

rewriteCaseChildren

public static List<org.apache.calcite.rex.RexNode> rewriteCaseChildren(String funcText,
                                                                       List<org.apache.calcite.rex.RexNode> childRexNodeLst,
                                                                       org.apache.calcite.rex.RexBuilder rexBuilder)
                                                                throws SemanticException

Throws:

SemanticException

adjustCaseBranchTypes

public static List<org.apache.calcite.rex.RexNode> adjustCaseBranchTypes(List<org.apache.calcite.rex.RexNode> nodes,
                                                                         org.apache.calcite.rel.type.RelDataType retType,
                                                                         org.apache.calcite.rex.RexBuilder rexBuilder)

Adds explicit casts if Calcite's type system could not resolve the CASE branches to a common type. Calcite is more stricter than hive w.r.t type conversions. If a CASE has branches with string/int/boolean branch types; there is no common type.

rewriteExtractDateChildren

public static List<org.apache.calcite.rex.RexNode> rewriteExtractDateChildren(org.apache.calcite.sql.SqlOperator op,
                                                                              List<org.apache.calcite.rex.RexNode> childRexNodeLst,
                                                                              org.apache.calcite.rex.RexBuilder rexBuilder)

rewriteFloorDateChildren

public static List<org.apache.calcite.rex.RexNode> rewriteFloorDateChildren(org.apache.calcite.sql.SqlOperator op,
                                                                            List<org.apache.calcite.rex.RexNode> childRexNodeLst,
                                                                            org.apache.calcite.rex.RexBuilder rexBuilder)

rewriteToDateChildren

public static List<org.apache.calcite.rex.RexNode> rewriteToDateChildren(List<org.apache.calcite.rex.RexNode> childRexNodeLst,
                                                                         org.apache.calcite.rex.RexBuilder rexBuilder)

transformInToOrOperands

public static List<org.apache.calcite.rex.RexNode> transformInToOrOperands(List<org.apache.calcite.rex.RexNode> operands,
                                                                           org.apache.calcite.rex.RexBuilder rexBuilder)

The method tries to rewrite an the operands of an IN function call into the operands for an OR function call. For instance:

 (c) IN ( v1, v2, ...) => c=v1 || c=v2 || ...
 Input: (c, v1, v2, ...)
 Output: (c=v1, c=v2, ...)
 

Or:

 (c,d) IN ( (v1,v2), (v3,v4), ...) => (c=v1 && d=v2) || (c=v3 && d=v4) || ...
 Input: ((c,d), (v1,v2), (v3,v4), ...)
 Output: (c=v1 && d=v2, c=v3 && d=v4, ...)
 

Returns null if the transformation fails, e.g., when non-deterministic calls are found in the expressions.

rewriteInClauseChildren

public static List<org.apache.calcite.rex.RexNode> rewriteInClauseChildren(org.apache.calcite.sql.SqlOperator op,
                                                                           List<org.apache.calcite.rex.RexNode> childRexNodeLst,
                                                                           org.apache.calcite.rex.RexBuilder rexBuilder)
                                                                    throws SemanticException

Throws:

SemanticException

rewriteCoalesceChildren

public static List<org.apache.calcite.rex.RexNode> rewriteCoalesceChildren(List<org.apache.calcite.rex.RexNode> childRexNodeLst,
                                                                           org.apache.calcite.rex.RexBuilder rexBuilder)

rewriteBetweenChildren

public static List<org.apache.calcite.rex.RexNode> rewriteBetweenChildren(List<org.apache.calcite.rex.RexNode> childRexNodeLst,
                                                                          org.apache.calcite.rex.RexBuilder rexBuilder)

convert

protected org.apache.calcite.rex.RexNode convert(ExprNodeConstantDesc literal)
                                          throws CalciteSemanticException

Throws:

CalciteSemanticException