caoxuewen created SPARK-21707: --------------------------------- Summary: Improvement a special case for non-deterministic filters in optimizer Key: SPARK-21707 URL: https://issues.apache.org/jira/browse/SPARK-21707 Project: Spark Issue Type: Improvement Components: SQL Affects Versions: 2.3.0 Reporter: caoxuewen
Currently, Did a lot of special handling for non-deterministic projects and filters in optimizer. but not good enough. this patch add a new special case for non-deterministic filters. Deal with that we only need to read user needs fields for non-deterministic filters in optimizer. For example, the condition of filters is nondeterministic. e.g:contains nondeterministic function(rand function), HiveTableScans optimizer generated: ``` HiveTableScans plan:Aggregate [k#2L], [k#2L, k#2L, sum(cast(id#1 as bigint)) AS sum(id)#395L] +- Project [d004#205 AS id#1, CEIL(c010#214) AS k#2L] +- Filter ((isnotnull(d004#205) && (rand(-4530215890880734772) <= 0.5)) && NOT (cast(cast(d004#205 as decimal(10,0)) as decimal(11,1)) = 0.0)) +- MetastoreRelation XXX_database, XXX_table HiveTableScans plan:Project [d004#205 AS id#1, CEIL(c010#214) AS k#2L] +- Filter ((isnotnull(d004#205) && (rand(-4530215890880734772) <= 0.5)) && NOT (cast(cast(d004#205 as decimal(10,0)) as decimal(11,1)) = 0.0)) +- MetastoreRelation XXX_database, XXX_table HiveTableScans plan:Filter ((isnotnull(d004#205) && (rand(-4530215890880734772) <= 0.5)) && NOT (cast(cast(d004#205 as decimal(10,0)) as decimal(11,1)) = 0.0)) +- MetastoreRelation XXX_database, XXX_table HiveTableScans plan:MetastoreRelation XXX_database, XXX_table ``` so HiveTableScan will read all the fields from table. but we only need to ‘d004’ and 'c010' . it will affect the performance of task. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org