Mostafa Mokhtar created HIVE-7982:
-------------------------------------
Summary: Regression in explain with CBO enabled due to issuing
query per K,V for the stats
Key: HIVE-7982
URL: https://issues.apache.org/jira/browse/HIVE-7982
Project: Hive
Issue Type: Bug
Components: CBO
Affects Versions: 0.14.0
Reporter: Mostafa Mokhtar
Assignee: Mostafa Mokhtar
Fix For: 0.14.0
With CBO we need the correct set of indexes to provide an efficient Read/Write
access.
These indexes improve performance of Explain plan and Analyzed table by 60% and
300%.
{code}
MySQL
CREATE INDEX PART_COL_STATS_N50 ON PART_COL_STATS
(DB_NAME,TABLE_NAME,COLUMN_NAME) USING BTREE;
MsSQL
CREATE INDEX PART_COL_STATS_N50 ON PART_COL_STATS
(DB_NAME,TABLE_NAME,COLUMN_NAME);
Oracle
CREATE INDEX PART_COL_STATS_N50 ON PART_COL_STATS
(DB_NAME,TABLE_NAME,COLUMN_NAME);
Postgres
CREATE INDEX "PART_COL_STATS_N50" ON "PART_COL_STATS" USING btree
("DB_NAME","TABLE_NAME","COLUMN_NAME");
{code}
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