Github user gparai commented on a diff in the pull request:
https://github.com/apache/drill/pull/729#discussion_r103608020
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/common/DrillRelOptUtil.java
---
@@ -169,4 +182,99 @@ private static boolean containIdentity(List<? extends
RexNode> exps,
}
return true;
}
+
+ /**
+ * Returns whether statistics-based estimates or guesses are used by the
optimizer
+ * */
+ public static boolean guessRows(RelNode rel) {
+ final PlannerSettings settings =
+
rel.getCluster().getPlanner().getContext().unwrap(PlannerSettings.class);
+ if (!settings.useStatistics()) {
+ return true;
+ }
+ if (rel instanceof RelSubset) {
+ if (((RelSubset) rel).getBest() != null) {
+ return guessRows(((RelSubset) rel).getBest());
+ } else if (((RelSubset) rel).getOriginal() != null) {
+ return guessRows(((RelSubset) rel).getOriginal());
+ }
+ } else if (rel instanceof HepRelVertex) {
+ if (((HepRelVertex) rel).getCurrentRel() != null) {
+ return guessRows(((HepRelVertex) rel).getCurrentRel());
+ }
+ } else if (rel instanceof TableScan) {
+ DrillTable table = rel.getTable().unwrap(DrillTable.class);
+ if (table == null) {
+ table =
rel.getTable().unwrap(DrillTranslatableTable.class).getDrillTable();
+ }
+ if (table != null && table.getStatsTable() != null) {
+ return false;
+ } else {
+ return true;
+ }
+ } else {
+ for (RelNode child : rel.getInputs()) {
+ if (guessRows(child)) { // at least one child is a guess
+ return true;
+ }
+ }
+ }
+ return false;
+ }
+
+ private static boolean findLikeOrRangePredicate(RexNode predicate) {
+ if ((predicate == null) || predicate.isAlwaysTrue()) {
+ return false;
+ }
+ for (RexNode pred : RelOptUtil.conjunctions(predicate)) {
+ for (RexNode orPred : RelOptUtil.disjunctions(pred)) {
+ if (!orPred.isA(SqlKind.EQUALS) ||
+ orPred.isA(SqlKind.LIKE)) {
+ return true;
+ }
+ }
+ }
+ return false;
+ }
+
+ public static boolean analyzeSimpleEquiJoin(Join join, int[]
joinFieldOrdinals) {
--- End diff --
Done
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