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new e4c5b954ef [CALCITE-5101] LISTAGG function with DISTINCT and ORDER BY
fails
e4c5b954ef is described below
commit e4c5b954ef0158f3100fd2d106408056f2d21cbf
Author: Yu Xu <[email protected]>
AuthorDate: Tue Jun 2 00:24:48 2026 +0800
[CALCITE-5101] LISTAGG function with DISTINCT and ORDER BY fails
---
.../AggregateExpandDistinctAggregatesRule.java | 122 +++++++++++++++++++--
.../enumerable/EnumerableSortedAggregateTest.java | 100 +++++++++++++++++
2 files changed, 210 insertions(+), 12 deletions(-)
diff --git
a/core/src/main/java/org/apache/calcite/rel/rules/AggregateExpandDistinctAggregatesRule.java
b/core/src/main/java/org/apache/calcite/rel/rules/AggregateExpandDistinctAggregatesRule.java
index b25eceb38e..afb4edbf8e 100644
---
a/core/src/main/java/org/apache/calcite/rel/rules/AggregateExpandDistinctAggregatesRule.java
+++
b/core/src/main/java/org/apache/calcite/rel/rules/AggregateExpandDistinctAggregatesRule.java
@@ -19,7 +19,9 @@
import org.apache.calcite.plan.Contexts;
import org.apache.calcite.plan.RelOptRuleCall;
import org.apache.calcite.plan.RelRule;
+import org.apache.calcite.rel.RelCollation;
import org.apache.calcite.rel.RelCollations;
+import org.apache.calcite.rel.RelFieldCollation;
import org.apache.calcite.rel.core.Aggregate;
import org.apache.calcite.rel.core.Aggregate.Group;
import org.apache.calcite.rel.core.AggregateCall;
@@ -221,9 +223,13 @@ public AggregateExpandDistinctAggregatesRule(
// one or more non-distinct aggregates
&& !nonDistinctAggCalls.isEmpty()) {
final RelBuilder relBuilder = call.builder();
- convertSingletonDistinct(relBuilder, aggregate, distinctCallArgLists);
- call.transformTo(relBuilder.build());
- return;
+ final RelBuilder result =
+ convertSingletonDistinct(relBuilder, aggregate,
distinctCallArgLists);
+ if (result != null) {
+ call.transformTo(result.build());
+ return;
+ }
+ // If convertSingletonDistinct returns null, fall through to other
strategies
}
// Create a list of the expressions which will yield the final result.
@@ -279,6 +285,14 @@ public AggregateExpandDistinctAggregatesRule(
call.transformTo(relBuilder.build());
}
+ private static RelCollation remapCollation(RelCollation collation,
+ Map<Integer, Integer> sourceOf) {
+ if (collation.equals(RelCollations.EMPTY)) {
+ return RelCollations.EMPTY;
+ }
+ return RelCollations.permute(collation, sourceOf);
+ }
+
/**
* Converts an aggregate with one distinct aggregate and one or more
* non-distinct aggregates to multi-phase aggregates (see reference example
@@ -287,15 +301,39 @@ public AggregateExpandDistinctAggregatesRule(
* @param relBuilder Contains the input relational expression
* @param aggregate Original aggregate
* @param argLists Arguments and filters to the distinct aggregate function
+ * @return relBuilder if conversion succeeded, or null if not applicable
*
*/
- private static RelBuilder convertSingletonDistinct(RelBuilder relBuilder,
+ private static @Nullable RelBuilder convertSingletonDistinct(RelBuilder
relBuilder,
Aggregate aggregate, Set<Pair<List<Integer>, Integer>> argLists) {
// In this case, we are assuming that there is a single distinct function.
// So make sure that argLists is of size one.
checkArgument(argLists.size() == 1);
+ // Check if any DISTINCT aggregate has ORDER BY columns not in GROUP BY or
args.
+ // If so, we cannot safely apply this optimization because it would
violate DISTINCT
+ // semantics (adding ORDER BY columns to GROUP BY would incorrectly
preserve duplicate
+ // values of the DISTINCT column with different ORDER BY values).
+ final ImmutableBitSet groupSet = aggregate.getGroupSet();
+ final Pair<List<Integer>, Integer> pair =
Iterables.getOnlyElement(argLists);
+ final List<Integer> distinctArgs = ImmutableList.copyOf(pair.left);
+ final ImmutableBitSet distinctArgSet = ImmutableBitSet.of(distinctArgs);
+
+ for (AggregateCall aggCall : aggregate.getAggCallList()) {
+ if (!aggCall.isDistinct() || !aggCall.getArgList().equals(distinctArgs))
{
+ continue;
+ }
+ for (RelFieldCollation fc : aggCall.collation.getFieldCollations()) {
+ int colIdx = fc.getFieldIndex();
+ // Check if this ORDER BY column is in GROUP BY or in DISTINCT args
+ if (!groupSet.get(colIdx) && !distinctArgSet.get(colIdx)) {
+ // Cannot optimize: ORDER BY references a column outside GROUP BY
and DISTINCT args
+ return null;
+ }
+ }
+ }
+
// For example,
// SELECT deptno, COUNT(*), SUM(bonus), MIN(DISTINCT sal)
// FROM emp
@@ -315,7 +353,11 @@ private static RelBuilder
convertSingletonDistinct(RelBuilder relBuilder,
final ImmutableBitSet originalGroupSet = aggregate.getGroupSet();
// Add the distinct aggregate column(s) to the group-by columns,
- // if not already a part of the group-by
+ // if not already a part of the group-by.
+ // NOTE: Do NOT add ORDER BY columns to bottomGroups because that would
break DISTINCT
+ // semantics. For example, SUM(DISTINCT sal) WITHIN GROUP (ORDER BY bonus)
would incorrectly
+ // produce multiple rows for the same sal value if they have different
bonus values,
+ // violating the DISTINCT guarantee. ORDER BY columns will be handled
separately below.
final NavigableSet<Integer> bottomGroups = new
TreeSet<>(aggregate.getGroupSet().asList());
for (AggregateCall aggCall : originalAggCalls) {
if (aggCall.isDistinct()) {
@@ -360,6 +402,14 @@ private static RelBuilder
convertSingletonDistinct(RelBuilder relBuilder,
for (int arg : aggCall.getArgList()) {
newArgList.add(bottomGroups.headSet(arg, false).size());
}
+ // Remap collation field indices using the same bottomGroups formula
+ final List<RelFieldCollation> remappedFCs = new ArrayList<>();
+ for (RelFieldCollation fc : aggCall.collation.getFieldCollations()) {
+ int newIdx = bottomGroups.headSet(fc.getFieldIndex(), false).size();
+ remappedFCs.add(fc.withFieldIndex(newIdx));
+ }
+ RelCollation newCollation =
aggCall.collation.equals(RelCollations.EMPTY)
+ ? RelCollations.EMPTY : RelCollations.of(remappedFCs);
newCall =
AggregateCall.create(aggCall.getParserPosition(),
aggCall.getAggregation(),
@@ -370,7 +420,7 @@ private static RelBuilder
convertSingletonDistinct(RelBuilder relBuilder,
newArgList,
-1,
aggCall.distinctKeys,
- aggCall.collation,
+ newCollation,
aggregate.hasEmptyGroup(),
relBuilder.peek(),
aggCall.getType(),
@@ -649,11 +699,14 @@ private static void
rewriteUsingGroupingSets(RelOptRuleCall call,
final String upperAggName = upperAggCallName(aggCall, g);
// Each filtered grouping set emits exactly one row per group,
// so MIN just passes that value through without re-aggregation
+ // Remap collation indices through fullGroupSet
+ final RelCollation remappedCollation =
+ remapCollationForGroupingSets(aggCall.collation, fullGroupSet);
final AggregateCall newCall =
AggregateCall.create(aggCall.getParserPosition(),
SqlStdOperatorTable.MIN, false, aggCall.isApproximate(),
aggCall.ignoreNulls(), aggCall.rexList, args, newFilterArg,
- aggCall.distinctKeys, aggCall.collation,
aggregate.hasEmptyGroup(),
+ aggCall.distinctKeys, remappedCollation,
aggregate.hasEmptyGroup(),
relBuilder.peek(), null, upperAggName);
upperAggCalls.add(newCall);
ordinals.add(topGroupCount + upperAggCalls.size() - 1);
@@ -669,11 +722,14 @@ private static void
rewriteUsingGroupingSets(RelOptRuleCall call,
requireNonNull(filters.get(Pair.of(newGroupSet,
aggCall.filterArg)),
() -> "filters.get(" + newGroupSet + ", " +
aggCall.filterArg + ")");
final String upperAggName = upperAggCallName(aggCall, g);
+ // Remap collation indices through fullGroupSet
+ final RelCollation remappedCollation =
+ remapCollationForGroupingSets(aggCall.collation, fullGroupSet);
final AggregateCall newCall =
AggregateCall.create(aggCall.getParserPosition(),
aggCall.getAggregation(), false,
aggCall.isApproximate(), aggCall.ignoreNulls(),
aggCall.rexList, newArgList, newFilterArg,
- aggCall.distinctKeys, aggCall.collation,
+ aggCall.distinctKeys, remappedCollation,
aggregate.hasEmptyGroup(), relBuilder.peek(), null,
upperAggName);
upperAggCalls.add(newCall);
ordinals.add(topGroupCount + upperAggCalls.size() - 1);
@@ -864,6 +920,31 @@ private static int remap(ImmutableBitSet groupSet, int
arg) {
return arg < 0 ? -1 : groupSet.indexOf(arg);
}
+ private static RelCollation remapCollationForGroupingSets(RelCollation
collation,
+ ImmutableBitSet fullGroupSet) {
+ if (collation.equals(RelCollations.EMPTY)) {
+ return RelCollations.EMPTY;
+ }
+ // Remap each field index through the fullGroupSet.
+ // fullGroupSet contains only columns that appear in at least one grouping
set.
+ // If an ORDER BY column is not in fullGroupSet, it means:
+ // 1. The column is not part of any grouping set combination
+ // 2. Different rows within the same logical group can have different
values
+ // 3. Sorting by such a column would be meaningless
+ // Therefore, we safely drop ORDER BY columns not in fullGroupSet. The
query
+ // planner should ensure ORDER BY columns are either in GROUP BY, in
aggregation
+ // arguments, or properly scoped for consistent values within each group.
+ final List<RelFieldCollation> remappedFCs = new ArrayList<>();
+ for (RelFieldCollation fc : collation.getFieldCollations()) {
+ int originalIdx = fc.getFieldIndex();
+ int newIdx = fullGroupSet.indexOf(originalIdx);
+ if (newIdx >= 0) {
+ remappedFCs.add(fc.withFieldIndex(newIdx));
+ }
+ }
+ return remappedFCs.isEmpty() ? RelCollations.EMPTY :
RelCollations.of(remappedFCs);
+ }
+
private static String upperAggCallName(AggregateCall aggCall,
int groupingSetIndex) {
String baseName = aggCall.getName();
@@ -1013,7 +1094,7 @@ private static void doRewrite(RelBuilder relBuilder,
Aggregate aggregate, int n,
continue;
}
- // Re-map arguments.
+ // Re-map arguments and collation.
final int argCount = aggCall.getArgList().size();
final List<Integer> newArgs = new ArrayList<>(argCount);
for (Integer arg : aggCall.getArgList()) {
@@ -1022,7 +1103,7 @@ private static void doRewrite(RelBuilder relBuilder,
Aggregate aggregate, int n,
final AggregateCall newAggCall =
AggregateCall.create(aggCall.getParserPosition(),
aggCall.getAggregation(), false,
aggCall.isApproximate(), aggCall.ignoreNulls(), aggCall.rexList,
- newArgs, -1, aggCall.distinctKeys, aggCall.collation,
+ newArgs, -1, aggCall.distinctKeys,
remapCollation(aggCall.collation, sourceOf),
aggCall.getType(), aggCall.getName());
assert refs.get(i) == null;
if (leftFields == null) {
@@ -1098,7 +1179,7 @@ private static void rewriteAggCalls(
continue;
}
- // Re-map arguments.
+ // Re-map arguments and collation.
final int argCount = aggCall.getArgList().size();
final List<Integer> newArgs = new ArrayList<>(argCount);
for (int j = 0; j < argCount; j++) {
@@ -1111,7 +1192,7 @@ private static void rewriteAggCalls(
AggregateCall.create(aggCall.getParserPosition(),
aggCall.getAggregation(), false,
aggCall.isApproximate(), aggCall.ignoreNulls(),
aggCall.rexList, newArgs, -1,
- aggCall.distinctKeys, aggCall.collation,
+ aggCall.distinctKeys, remapCollation(aggCall.collation,
sourceOf),
aggCall.getType(), aggCall.getName());
newAggCalls.set(i, newAggCall);
}
@@ -1193,6 +1274,23 @@ private static RelBuilder
createSelectDistinct(RelBuilder relBuilder,
sourceOf.put(arg, projects.size());
RexInputRef.add2(projects, arg, childFields);
}
+
+ // Also project ORDER BY columns from WITHIN GROUP for DISTINCT agg calls.
+ // If the ORDER BY references a column not already in GROUP BY or argList,
+ // it must be projected here so that collation indices can be properly
remapped.
+ for (AggregateCall aggCall : aggregate.getAggCallList()) {
+ if (!aggCall.isDistinct() || !aggCall.getArgList().equals(argList)) {
+ continue;
+ }
+ for (RelFieldCollation fc : aggCall.collation.getFieldCollations()) {
+ int col = fc.getFieldIndex();
+ if (sourceOf.get(col) == null) {
+ sourceOf.put(col, projects.size());
+ RexInputRef.add2(projects, col, childFields);
+ }
+ }
+ }
+
relBuilder.project(projects.leftList(), projects.rightList());
// Get the distinct values of the GROUP BY fields and the arguments
diff --git
a/core/src/test/java/org/apache/calcite/test/enumerable/EnumerableSortedAggregateTest.java
b/core/src/test/java/org/apache/calcite/test/enumerable/EnumerableSortedAggregateTest.java
index 1945dabaed..454beb2015 100644
---
a/core/src/test/java/org/apache/calcite/test/enumerable/EnumerableSortedAggregateTest.java
+++
b/core/src/test/java/org/apache/calcite/test/enumerable/EnumerableSortedAggregateTest.java
@@ -133,6 +133,106 @@ public class EnumerableSortedAggregateTest {
"commission=null; num_dept=1");
}
+ /** Test case for
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-5101";>[CALCITE-5101]
+ * LISTAGG(DISTINCT ...) WITHIN GROUP fails with
ArrayIndexOutOfBoundsException</a>. */
+ @Test void listAggDistinctWithinGroupOrderByNonGroupColumn() {
+ // FAILING CASE: LISTAGG(DISTINCT ...) WITHIN GROUP (ORDER BY
non-group-column)
+ // Previously threw: ArrayIndexOutOfBoundsException: Index 2 out of bounds
for length 2
+ // Now fixed: ORDER BY salary is properly projected and remapped.
+ // Within each group, names are ordered by salary (ascending).
+ // deptno=10: Sebastian (7000), Bill (10000), Theodore (11500)
+ // deptno=20: Eric (8000)
+ tester(false, new HrSchema())
+ .query("select deptno, "
+ + "LISTAGG(DISTINCT name) WITHIN GROUP (ORDER BY salary) as names "
+ + "from emps group by deptno")
+ .returnsUnordered(
+ "deptno=10; names=Sebastian,Bill,Theodore",
+ "deptno=20; names=Eric");
+ }
+
+ @Test void listAggDistinctWithoutOrderBy() {
+ // WORKING CASE: LISTAGG(DISTINCT ...) without ORDER BY - always worked
+ tester(false, new HrSchema())
+ .query("select deptno, "
+ + "LISTAGG(DISTINCT name) as names "
+ + "from emps group by deptno")
+ .returnsUnordered(
+ "deptno=10; names=Bill,Sebastian,Theodore",
+ "deptno=20; names=Eric");
+ }
+
+ @Test void listAggWithoutDistinctWithinGroupOrderBy() {
+ // WORKING CASE: LISTAGG(...) WITHIN GROUP (ORDER BY non-group-column)
+ // without DISTINCT - always worked
+ tester(false, new HrSchema())
+ .query("select deptno, "
+ + "LISTAGG(name) WITHIN GROUP (ORDER BY salary) as names "
+ + "from emps group by deptno")
+ .returnsUnordered(
+ "deptno=10; names=Sebastian,Bill,Theodore",
+ "deptno=20; names=Eric");
+ }
+
+ @Test void listAggDistinctWithinGroupOrderByAggColumn() {
+ // WORKING CASE: LISTAGG(DISTINCT ...) WITHIN GROUP (ORDER BY
aggregated-column)
+ // - always worked because the aggregated column is in the re-grouped input
+ tester(false, new HrSchema())
+ .query("select deptno, "
+ + "LISTAGG(DISTINCT name) WITHIN GROUP (ORDER BY name) as names "
+ + "from emps group by deptno")
+ .returnsUnordered(
+ "deptno=10; names=Bill,Sebastian,Theodore",
+ "deptno=20; names=Eric");
+ }
+
+ @Test void listAggMultipleDistinctWithinGroupOrderByNonGroupColumn() {
+ // Test case for multiple DISTINCT aggregates with different ORDER BY
columns
+ // Previously threw: ArrayIndexOutOfBoundsException
+ // ORDER BY salary for first agg (not a group key), ORDER BY name for
second
+ // This tests that collation indices are properly remapped in
rewriteUsingGroupingSets
+ tester(false, new HrSchema())
+ .query("select deptno, "
+ + "LISTAGG(DISTINCT name) WITHIN GROUP (ORDER BY salary) as
names_by_salary, "
+ + "LISTAGG(DISTINCT commission) WITHIN GROUP (ORDER BY name) as
commissions_by_name "
+ + "from emps group by deptno")
+ .returnsUnordered(
+ "deptno=10; names_by_salary=Theodore,Sebastian,Bill;
commissions_by_name=250,1000",
+ "deptno=20; names_by_salary=Eric; commissions_by_name=500");
+ }
+
+ @Test void
groupingSetsWithDistinctAggAndCollationReferencingOutsideGroupingSets() {
+ // Test that result collation is safely reduced when ORDER BY references
+ // columns not present in all grouping sets.
+ // Why result collation can have fewer elements than input collation:
+ // - Input collation may reference {salary, deptno, name}
+ // - fullGroupSet contains only {deptno, name} (columns in some grouping
sets)
+ // - salary is NOT in fullGroupSet (not part of any GROUPING SETS
combination)
+ // - In GROUPING SETS ((deptno), (name), ()), salary has inconsistent
values
+ // within each logical group, so sorting by it would be meaningless
+ // - Result collation safely drops salary and keeps only {deptno, name}
+ // This tests that
AggregateExpandDistinctAggregatesRule.remapCollationForGroupingSets
+ // correctly filters out columns not in fullGroupSet.
+ // The key point: this query should not throw
ArrayIndexOutOfBoundsException.
+ tester(false, new HrSchema())
+ .query("select deptno, name, "
+ + "LISTAGG(DISTINCT salary) WITHIN GROUP (ORDER BY salary) as
salaries "
+ + "from emps "
+ + "group by grouping sets ((deptno), (name), ())")
+ .returnsUnordered(
+ // Grouping by deptno - contains the 3 salaries from deptno=10
+ "deptno=10; name=null; salaries=10000.0,7000.0,11500.0",
+ "deptno=20; name=null; salaries=8000.0",
+ // Grouping by name - single salary per name
+ "deptno=null; name=Bill; salaries=10000.0",
+ "deptno=null; name=Eric; salaries=8000.0",
+ "deptno=null; name=Sebastian; salaries=7000.0",
+ "deptno=null; name=Theodore; salaries=11500.0",
+ // Grand total - all 4 distinct salaries
+ "deptno=null; name=null; salaries=10000.0,8000.0,7000.0,11500.0");
+ }
+
private CalciteAssert.AssertThat tester(boolean forceDecorrelate,
Object schema) {
return CalciteAssert.that()
