YuvalItzchakov edited a comment on pull request #15307:
URL: https://github.com/apache/flink/pull/15307#issuecomment-814002061
@fsk119 A question about the implementation:
```
if (result.getRemainingFilters().isEmpty() && unconvertedPredicates.length
== 0) {
call.transformTo(newScan);
} else { .. }
```
If there are no remaining filters, should we not still include the calc in
the plan? Currently it's only pushing the scan.
**Edit:**
Modifying the rule to:
```java
SupportsFilterPushDown.Result result = pushdownResultWithScan._1;
FlinkLogicalTableSourceScan newScan = pushdownResultWithScan._2;
// build new calc program
RexProgramBuilder programBuilder =
new RexProgramBuilder(newScan.getRowType(),
call.builder().getRexBuilder());
if (!result.getRemainingFilters().isEmpty()) {
RexNode[] unconvertedPredicates = extractedPredicates._2;
RexNode remainingCondition = getRemainingConditions(
relBuilder,
result,
unconvertedPredicates);
programBuilder.addCondition(remainingCondition);
}
List<RexNode> projects =
originProgram.getProjectList().stream()
.map(originProgram::expandLocalRef)
.collect(Collectors.toList());
List<String> outputFieldNames =
originProgram.getOutputRowType().getFieldNames();
for (int i = 0; i < projects.size(); i++) {
programBuilder.addProject(projects.get(i),
outputFieldNames.get(i));
}
FlinkLogicalCalc newCalc =
FlinkLogicalCalc.create(newScan,
programBuilder.getProgram());
call.transformTo(newCalc);
```
Fixes the issue. We always push the Calc back (instead of the underlying
Scan), we just check whether we need to apply any predicates or not.
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