zabetak commented on code in PR #5196:
URL: https://github.com/apache/hive/pull/5196#discussion_r2048601863
##########
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/HiveFilterSortPredicates.java:
##########
@@ -220,6 +234,37 @@ public Double visitCall(RexCall call) {
return cost + functionCost(call);
}
+
+ private Double getSearchCost(RexCall call) {
+ HiveCalciteUtil.SearchTransformer<Double> transformer = new
HiveCalciteUtil.SearchTransformer<>();
+ transformer.transform(rexBuilder, call,
+ new RexFunctionCost(this.rexBuilder) {
+ @Override
+ public Double visitLiteral(RexLiteral literal) {
+ return HiveRelMdSize.INSTANCE.typeValueSize(literal.getType(),
literal.getValueAs(Comparable.class));
+ }
+
+ @Override
+ public Double visitInputRef(RexInputRef inputRef) {
+ return
HiveRelMdSize.INSTANCE.averageTypeValueSize(inputRef.getType());
+ }
+ });
+
+ List<Double> operandCosts = new ArrayList<>();
+
+ if (!transformer.inNodes.isEmpty()) {
+ Double inOperandCosts =
transformer.inNodes.stream().filter(Objects::nonNull).reduce(1D, Double::sum);
+ Double inFunctionCost = 2d * (transformer.inNodes.size() - 1);
+ operandCosts.add(inOperandCosts + inFunctionCost);
+ }
+ operandCosts.addAll(transformer.nodes);
+
+ Double searchOperandCost =
operandCosts.stream().filter(Objects::nonNull).reduce(1D, Double::sum);
+ // functionCost is essentially the cost of conjunctions or disjunctions
+ Double functionCost = operandCosts.size() == 1 ? 0D : 1d *
operandCosts.size();
+
+ return searchOperandCost + functionCost;
+ }
Review Comment:
Obsolete comment, please ignore.
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