lincoln-lil commented on code in PR #21704:
URL: https://github.com/apache/flink/pull/21704#discussion_r1089940415
##########
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/rules/logical/PushProjectIntoTableSourceScanRule.java:
##########
@@ -139,10 +139,23 @@ public void onMatch(RelOptRuleCall call) {
final FlinkTypeFactory typeFactory = unwrapTypeFactory(scan);
final ResolvedSchema schema =
sourceTable.contextResolvedTable().getResolvedSchema();
final RowType producedType = createProducedType(schema,
sourceTable.tableSource());
- final NestedSchema projectedSchema =
+ NestedSchema projectedSchema =
NestedProjectionUtil.build(
getProjections(project, scan),
typeFactory.buildRelNodeRowType(producedType));
+ // we can not perform an empty column query to the table scan, just
choose the first column
+ // in such case
+ if (projectedSchema.columns().isEmpty()) {
+ if (scan.getRowType().getFieldCount() == 0) {
+ return;
Review Comment:
I was going to add an assertion here, just a protection for the following
lines
##########
flink-table/flink-table-planner/src/test/scala/org/apache/flink/table/planner/plan/stream/sql/agg/AggregateTest.scala:
##########
@@ -395,4 +395,48 @@ class AggregateTest extends TableTestBase {
def testApproximateCountDistinct(): Unit = {
util.verifyExecPlan("SELECT APPROX_COUNT_DISTINCT(b) FROM MyTable")
}
+
+ @Test
+ def testCountStart(): Unit = {
+ util.tableEnv.executeSql("""
+ |CREATE TABLE src (
+ | id VARCHAR,
+ | cnt BIGINT
+ |) WITH (
+ | 'connector' = 'values'
+ |)
+ |""".stripMargin)
+ util.verifyExecPlan("SELECT COUNT(*) FROM src")
+ }
+
+ @Test
+ def testCountStartWithMetadata(): Unit = {
Review Comment:
ok
##########
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/rules/logical/PushProjectIntoTableSourceScanRule.java:
##########
@@ -139,10 +139,23 @@ public void onMatch(RelOptRuleCall call) {
final FlinkTypeFactory typeFactory = unwrapTypeFactory(scan);
final ResolvedSchema schema =
sourceTable.contextResolvedTable().getResolvedSchema();
final RowType producedType = createProducedType(schema,
sourceTable.tableSource());
- final NestedSchema projectedSchema =
+ NestedSchema projectedSchema =
NestedProjectionUtil.build(
getProjections(project, scan),
typeFactory.buildRelNodeRowType(producedType));
+ // we can not perform an empty column query to the table scan, just
choose the first column
+ // in such case
+ if (projectedSchema.columns().isEmpty()) {
+ if (scan.getRowType().getFieldCount() == 0) {
+ return;
+ }
+ RexInputRef firstFieldRef = RexInputRef.of(0, scan.getRowType());
+ projectedSchema =
Review Comment:
I also remember discussing this case with you a long time ago, but I didn't
find any record of it in the commit history
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