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IMPALA-898: Support explicit column names in WITH-clause views.

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Example:
WITH t(c1, c2) AS (SELECT int_col, bool_col FROM functional.alltypes)
SELECT * FROM t

This will create a local view with the 'int_col' and 'bool_col' columns labeled as 'c1'
and 'c2'. If the number of labels is less than the number of columns, then the remaining
columns in the local view will be labeled as the corresponding columns in the query
statement. Therefore, this is also a valid query (only 'int_col' will be labeled as
'c1'):

WITH t(c1) AS (SELECT int_col, bool_col FROM functional.alltypes)
SELECT * FROM t

Change-Id: Ie3a559ca9eaf95c6980c5695a49f02010c42899b
Reviewed-on: http://gerrit.cloudera.org:8080/717
Reviewed-by: Vlad Berindei <vlad.berindei@cloudera.com>
Tested-by: Internal Jenkins
This commit is contained in:
Vlad Berindei
2015-08-28 17:44:57 -07:00
committed by Internal Jenkins
parent bcc73a36da
commit cfc3952a83
10 changed files with 181 additions and 12 deletions
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43
testdata/workloads/functional-query/queries/QueryTest/with-clause.test vendored
View File

@@ -19,9 +19,36 @@ select x, y from t order by y limit 10
BIGINT, STRING
====
---- QUERY
# Basic tests with a single with-clause view with column labels.
with t(c1, c2) as (select int_col, bigint_col y from functional.alltypestiny)
select * from t limit 1
---- RESULTS
0,0
---- TYPES
INT, BIGINT
---- LABELS
C1, C2
====
---- QUERY
with t(c1) as (select int_col, bigint_col from functional.alltypestiny)
select * from t limit 1
---- RESULTS
0,0
---- TYPES
INT, BIGINT
---- LABELS
C1, BIGINT_COL
====
---- QUERY
with t(c1, c2) as (select int_col from functional.alltypestiny)
select * from t limit 1
---- CATCH
AnalysisException: WITH-clause view 't' returns 1 columns, but 2 labels were specified.
====
---- QUERY
# Multiple views in with-clause. Only one view is used.
with t1 as (select int_col x, bigint_col y from functional.alltypestiny),
t2 as (select 1 x , 10 y), t3 as (values(2 x , 20 y), (3, 30))
t2 as (select 1 x, 10 y), t3 as (values(2 x, 20 y), (3, 30))
select x, y from t2
---- RESULTS
1,10
@@ -31,7 +58,7 @@ TINYINT, TINYINT
---- QUERY
# Multiple views in with-clause. All views are used in a union.
with t1 as (select int_col x, bigint_col y from functional.alltypestiny),
t2 as (select 1 x , 10 y), t3 as (values(2 x , 20 y), (3, 30))
t2 as (select 1 x, 10 y), t3 as (values(2 x, 20 y), (3, 30))
select * from t1 union all select * from t2 union all (select * from t3) order by x limit 20
---- RESULTS
0,0
@@ -49,6 +76,18 @@ select * from t1 union all select * from t2 union all (select * from t3) order b
INT, BIGINT
====
---- QUERY
with t1(c1, c2) as (select int_col x, bigint_col y from functional.alltypestiny),
t2(c3, c4) as (select 1 x, 10 y)
select * from t1 limit 1 union all select * from t2 limit 1
---- RESULTS
0,0
1,10
---- TYPES
INT, BIGINT
---- LABELS
C1, C2
====
---- QUERY
# Multiple views in with-clause. All views are used in a join.
with t1 as (select int_col x, bigint_col y from functional.alltypes limit 2),
t2 as (select int_col x, bigint_col y from functional.alltypestiny limit 2),