godfreyhe commented on code in PR #21704:
URL: https://github.com/apache/flink/pull/21704#discussion_r1089919691
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flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/rules/logical/PushProjectIntoTableSourceScanRule.java:
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@@ -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 clearly remember this case was handled before, maybe the code is removed
in some refactor/bugfix changes
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