zhengdong created CALCITE-1381:
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Summary: Function quantifier should be retained in a cloned Sql
call
Key: CALCITE-1381
URL: https://issues.apache.org/jira/browse/CALCITE-1381
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.6.0, 1.8.0
Reporter: zhengdong
Assignee: Julian Hyde
Priority: Minor
I found Calcite can’t execute queries like ‘select nullif(count(distinct
colunm),0) from table ’, and dumped ‘Plan after trimming unused fields’ like
this:
LogicalProject(NAME=[$0], GENDER=[CASE(=($1, 0), null, CAST($2):BIGINT)])
LogicalAggregate(group=[{0}], agg#0=[COUNT(DISTINCT
$1)], agg#1=[COUNT($1)])
LogicalProject(NAME=[$1], GENDER=[$3])
CsvTableScan(table=[[SALES, EMPS]], fields=[[0, 1,
2, 3, 4, 5, 6, 7, 8, 9]])
Then, I checked SqlNullifFunction rewriteCall method which used
SqlNode.clone(SqlParserPos pos) method to create SqlCase call.
Finally, I guess the root cause may be that the clone(SqlParserPos pos) method
discard the functionQuantifier which holds such as ‘distinct’ symbol when
create new SqlCall instance.
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