Flavio Pompermaier created PHOENIX-4508:
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Summary: Wrong query plan generation
Key: PHOENIX-4508
URL: https://issues.apache.org/jira/browse/PHOENIX-4508
Project: Phoenix
Issue Type: Bug
Affects Versions: 4.13.2-cdh5.11.2
Reporter: Flavio Pompermaier
In my Phoenix tables I found that one query ens successfully while another one,
logically equal, does not (unless that I don't apply some tuning to timeouts).
The 2 queries extract the same data but, while the first query terminates the
second does not.
PS: without the USE_SORT_MERGE_JOIN both queries weren't working
*SELECT /*+ USE_SORT_MERGE_JOIN */ COUNT(*)
FROM PEOPLE ds JOIN MYTABLE l ON ds.PERSON_ID = l.LOCALID
WHERE l.EID IS NULL AND l.DSID = 'PEOPLE' AND l.HAS_CANDIDATES = FALSE;*
```
+---------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
| PLAN
| EST_BYTES_READ | EST_ROWS_READ |
EST_INFO_TS |
+---------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
| SORT-MERGE-JOIN (INNER) TABLES
| 14155777900 | 12077867 |
1513754378759 |
| CLIENT 42-CHUNK 6168903 ROWS 11324622221 BYTES PARALLEL 3-WAY FULL SCAN
OVER PEOPLE | 14155777900 | 12077867 | 1513754378759
|
| SERVER FILTER BY FIRST KEY ONLY
| 14155777900 | 12077867 |
1513754378759 |
| CLIENT MERGE SORT
| 14155777900 | 12077867 |
1513754378759 |
| AND (SKIP MERGE)
| 14155777900 | 12077867 |
1513754378759 |
| CLIENT 15-CHUNK 5908964 ROWS 2831155679 BYTES PARALLEL 15-WAY RANGE SCAN
OVER MYTABLE [0] - [2] | 14155777900 | 12077867 | 1513754378759 |
| SERVER FILTER BY (EID IS NULL AND DSID = 'PEOPLE' AND HAS_CANDIDATES
= false) | 14155777900 | 12077867 | 1513754378759 |
| SERVER SORTED BY [L.LOCALID]
| 14155777900 | 12077867 |
1513754378759 |
| CLIENT MERGE SORT
| 14155777900 | 12077867 |
1513754378759 |
| CLIENT AGGREGATE INTO SINGLE ROW
| 14155777900 | 12077867 |
1513754378759 |
+---------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
10 rows selected (0.041 seconds)
```
*SELECT /*+ USE_SORT_MERGE_JOIN */ COUNT(*)
FROM (SELECT LOCALID FROM MYTABLE
WHERE EID IS NULL AND DSID = 'PEOPLE' AND HAS_CANDIDATES = FALSE) l JOIN PEOPLE
ds ON ds.PERSON_ID = l.LOCALID;*
```
+--------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
| PLAN
| EST_BYTES_READ | EST_ROWS_READ |
EST_INFO_TS |
+--------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
| SORT-MERGE-JOIN (INNER) TABLES
| 14155777900 | 12077867 |
1513754378759 |
| CLIENT 15-CHUNK 5908964 ROWS 2831155679 BYTES PARALLEL 3-WAY RANGE SCAN
OVER MYTABLE [0] - [2] | 14155777900 | 12077867 | 1513754378759 |
| SERVER FILTER BY (EID IS NULL AND DSID = 'PEOPLE' AND HAS_CANDIDATES
= false) | 14155777900 | 12077867 | 1513754378759 |
| CLIENT MERGE SORT
| 14155777900 | 12077867 |
1513754378759 |
| AND (SKIP MERGE)
| 14155777900 | 12077867 |
1513754378759 |
| CLIENT 42-CHUNK 6168903 ROWS 11324622221 BYTES PARALLEL 42-WAY FULL SCAN
OVER PEOPLE | 14155777900 | 12077867 | 1513754378759 |
| SERVER FILTER BY FIRST KEY ONLY
| 14155777900 | 12077867 |
1513754378759 |
| SERVER SORTED BY [DS.PERSON_ID]
| 14155777900 | 12077867 | 1513754378759
|
| CLIENT MERGE SORT
| 14155777900 | 12077867 |
1513754378759 |
| CLIENT AGGREGATE INTO SINGLE ROW
| 14155777900 | 12077867 |
1513754378759 |
+--------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
```
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