nrg4878 commented on code in PR #4744:
URL: https://github.com/apache/hive/pull/4744#discussion_r1439888993
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standalone-metastore/metastore-server/src/main/sql/derby/hive-schema-4.0.0-beta-2.derby.sql:
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@@ -266,9 +259,9 @@ CREATE UNIQUE INDEX "APP"."DBPRIVILEGEINDEX" ON
"APP"."DB_PRIVS" ("AUTHORIZER",
CREATE UNIQUE INDEX "APP"."DCPRIVILEGEINDEX" ON "APP"."DC_PRIVS"
("AUTHORIZER", "NAME", "PRINCIPAL_NAME", "PRINCIPAL_TYPE", "DC_PRIV",
"GRANTOR", "GRANTOR_TYPE");
-CREATE INDEX "APP"."PCS_STATS_IDX" ON "APP"."PART_COL_STATS"
("DB_NAME","TABLE_NAME","COLUMN_NAME","PARTITION_NAME","CAT_NAME");
+CREATE INDEX "APP"."PCS_STATS_IDX" ON "APP"."PART_COL_STATS"
("PART_ID","COLUMN_NAME");
Review Comment:
Having the column name in this index makes no sense to me because each stat
for each table/column will have its own index. This will not improve read
efficiency and have increased write performance.
Dont we fetch stats by partition or by table rather than by partitionid +
column or tableid + column.
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