lowka commented on code in PR #4221:
URL: https://github.com/apache/ignite-3/pull/4221#discussion_r1721263458
##########
modules/sql-engine/src/main/java/org/apache/ignite/internal/sql/engine/prepare/PlannerHelper.java:
##########
@@ -343,4 +360,171 @@ static boolean hasSubQuery(SqlNode node) {
return super.visit(call);
}
}
+
+
+ /**
+ * Tries to optimize a query that looks like {@code SELECT count(*)}.
+ *
+ * @param planner Planner.
+ * @param txContext Transactional context.
+ * @param node Query node.
+ * @return Plan node with list of aliases, if the optimization is
applicable.
+ */
+ public static @Nullable Pair<IgniteRel, List<String>>
tryOptimizeSelectCount(
+ IgnitePlanner planner,
+ @Nullable QueryTransactionContext txContext,
+ SqlNode node
+ ) {
+ if (txContext != null && txContext.explicitTx() != null) {
+ return null;
+ }
+
+ if (!(node instanceof SqlSelect)) {
+ return null;
+ }
+
+ SqlSelect select = (SqlSelect) node;
Review Comment:
Thanks. Fixed.
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