Sergey Nuyanzin created CALCITE-7474:
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Summary: LAST in MATCH_RECOGNIZE might return wrong result
Key: CALCITE-7474
URL: https://issues.apache.org/jira/browse/CALCITE-7474
Project: Calcite
Issue Type: Bug
Reporter: Sergey Nuyanzin
Assignee: Sergey Nuyanzin
depending on expanded or non-expanded column name the result is different
for instance
{code:sql}
select *
from "hr"."emps" match_recognize (
order by "empid" desc
measures "commission" as c,
LAST("empid") as empid
pattern (s up)
define up as up."commission" < prev(up."commission"));
{code}
returns
{noformat}
C EMPID
---- -----
1000 100
500 200
{noformat}
now if use expanded name like {{LAST("hr"."emps"."empid") as empid}} instead of
{{LAST("empid") as empid}}
{code:sql}
select *
from "hr"."emps" match_recognize (
order by "empid" desc
measures "commission" as c,
LAST("hr"."emps"."empid") as empid
pattern (s up)
define up as up."commission" < prev(up."commission"));
{code}
returns
{noformat}
C
----
1000
500
{noformat}
the reason is
https://github.com/apache/calcite/blob/0ce0c5ae2f7055f13551ebcde8e1aaa2ff17b469/core/src/main/java/org/apache/calcite/adapter/enumerable/RexImpTable.java#L4184-L4196
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