helloppx commented on a change in pull request #1680: [CALCITE-3621] Push down
sort to DB, SQL of Sort rel contains explicit field name instead of *
URL: https://github.com/apache/calcite/pull/1680#discussion_r360756860
##########
File path:
core/src/main/java/org/apache/calcite/rel/rel2sql/RelToSqlConverter.java
##########
@@ -634,6 +634,13 @@ public Result visit(Sort e) {
}
Result x = visitChild(0, e.getInput());
Builder builder = x.builder(e, Clause.ORDER_BY);
+ if (builder.select.getSelectList() == null) {
Review comment:
When JdbcSort is used, a regression issue will be trigged:
JdbcTest#testSelfJoinDifferentColumns()
RelToSqlConverter visit this Sort and then produce a SQL "SELECT * from (t
JOIN t0 ...) order by ...)". However t and t0 include one same name field
"last_name"
Before SQL:
select e1."full_name"
from "foodmart"."employee" as e1
join "foodmart"."employee" as e2 on e1."first_name" = e2."last_name"
order by e1."last_name" limit 3
REL:
JdbcToEnumerableConverter
JdbcProject(full_name=[$1], last_name=[$3])
JdbcSort(sort0=[$3], dir0=[ASC], fetch=[3])
JdbcJoin(condition=[=($2, $0)], joinType=[inner])
JdbcProject(last_name=[$3])
JdbcTableScan(table=[[foodmart, employee]])
JdbcProject(full_name=[$1], first_name=[$2], last_name=[$3])
JdbcTableScan(table=[[foodmart, employee]])
After SQL:
SELECT "t2"."full_name", "t2"."last_name0" AS "last_name"
FROM (SELECT *
FROM (SELECT "last_name"
FROM "foodmart"."employee") AS "t"
INNER JOIN (SELECT "full_name", "first_name", "last_name"
FROM "foodmart"."employee") AS "t0" ON "t"."last_name" = "t0"."first_name"
ORDER BY "t0"."last_name" NULLS LAST
LIMIT 3) AS "t2"
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
With regards,
Apache Git Services
