imay commented on a change in pull request #2991: Output null for hll and
bitmap column when select *
URL: https://github.com/apache/incubator-doris/pull/2991#discussion_r384252598
##########
File path: fe/src/main/java/org/apache/doris/analysis/SelectStmt.java
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@@ -786,15 +785,14 @@ private void expandStar(Analyzer analyzer, TableName
tblName) throws AnalysisExc
* Expand "*" for a particular tuple descriptor by appending
* refs for each column to selectListExprs.
*/
- private void expandStar(TableName tblName, TupleDescriptor desc) throws
AnalysisException {
+ private void expandStar(TableName tblName, TupleDescriptor desc) {
for (Column col : desc.getTable().getBaseSchema()) {
- if (col.getDataType() == PrimitiveType.HLL && !fromInsert) {
- throw new AnalysisException(Type.OnlyMetricTypeErrorMsg);
- }
- if (col.getAggregationType() == AggregateType.BITMAP_UNION &&
!fromInsert) {
- throw new AnalysisException(Type.OnlyMetricTypeErrorMsg);
+ PrimitiveType type = col.getDataType();
Review comment:
I don't think this change is very suitable.
1. I think the behavior of `select *` and `select a specific column` should
be consistent.
2. The current modification method may have problems when inserting into
select *, or when sub-queries, such as select hll_union (hll_col) from (select
*);
I think we can do it in backend. When encountering HLL type or Bitmap type,
ResultSink can send null directly.
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