NobiGo commented on code in PR #2774:
URL: https://github.com/apache/calcite/pull/2774#discussion_r855799246
##########
core/src/main/java/org/apache/calcite/rel/metadata/RelMdRowCount.java:
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@@ -147,45 +146,27 @@ public Double getRowCount(Calc rel, RelMetadataQuery mq) {
if (rowCount == null) {
return null;
}
- if (rel.offset instanceof RexDynamicParam) {
- return rowCount;
- }
- final int offset = rel.offset == null ? 0 :
RexLiteral.intValue(rel.offset);
+
+ final int offset = rel.offset instanceof RexLiteral ?
RexLiteral.intValue(rel.offset) : 0;
rowCount = Math.max(rowCount - offset, 0D);
- if (rel.fetch != null) {
- if (rel.fetch instanceof RexDynamicParam) {
- return rowCount;
- }
- final int limit = RexLiteral.intValue(rel.fetch);
- if (limit < rowCount) {
- return (double) limit;
- }
- }
- return rowCount;
+ final double limit =
+ rel.fetch instanceof RexLiteral ? RexLiteral.intValue(rel.fetch) :
rowCount;
+ return limit < rowCount ? limit : rowCount;
}
public @Nullable Double getRowCount(EnumerableLimit rel, RelMetadataQuery
mq) {
Double rowCount = mq.getRowCount(rel.getInput());
if (rowCount == null) {
return null;
}
- if (rel.offset instanceof RexDynamicParam) {
- return rowCount;
- }
- final int offset = rel.offset == null ? 0 :
RexLiteral.intValue(rel.offset);
+
+ final int offset = rel.offset instanceof RexLiteral ?
RexLiteral.intValue(rel.offset) : 0;
rowCount = Math.max(rowCount - offset, 0D);
Review Comment:
The limit number is the max row count that the SQL can return.
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