asolimando commented on code in PR #3264:
URL: https://github.com/apache/calcite/pull/3264#discussion_r1229976973
##########
core/src/main/java/org/apache/calcite/rel/rules/ProjectJoinRemoveRule.java:
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@@ -78,40 +86,56 @@ public ProjectJoinRemoveRule(
final Project project = call.rel(0);
final Join join = call.rel(1);
final boolean isLeftJoin = join.getJoinType() == JoinRelType.LEFT;
- int lower = isLeftJoin
- ? join.getLeft().getRowType().getFieldCount() : 0;
- int upper = isLeftJoin
- ? join.getRowType().getFieldCount()
- : join.getLeft().getRowType().getFieldCount();
-
- // Check whether the project uses columns whose index is between
- // lower(included) and upper(excluded).
- for (RexNode expr: project.getProjects()) {
- if (RelOptUtil.InputFinder.bits(expr).asList().stream().anyMatch(
- i -> i >= lower && i < upper)) {
- return;
- }
- }
+ final boolean isRightJoin = join.getJoinType() == JoinRelType.RIGHT;
+ final boolean isInnerJoin = join.getJoinType() == JoinRelType.INNER;
- final List<Integer> leftKeys = new ArrayList<>();
- final List<Integer> rightKeys = new ArrayList<>();
- RelOptUtil.splitJoinCondition(join.getLeft(), join.getRight(),
- join.getCondition(), leftKeys, rightKeys,
- new ArrayList<>());
+ // Check project range
+ ImmutableBitSet projectBits =
RelOptUtil.InputFinder.bits(project.getProjects(), null);
+ boolean onlyUseLeft = projectBits.asList().stream()
+ .allMatch(i -> i >= 0 && i <
join.getLeft().getRowType().getFieldCount());
Review Comment:
Please extract the common expressions like
`join.getLeft().getRowType().getFieldCount()`, the lambda is already long enough
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