Chengxiang Li created HIVE-10180: ------------------------------------ Summary: Loop optimization in ColumnArithmeticColumn.txt Key: HIVE-10180 URL: https://issues.apache.org/jira/browse/HIVE-10180 Project: Hive Issue Type: Sub-task Reporter: Chengxiang Li Assignee: Chengxiang Li Priority: Minor
JVM is quite strict on the code schema which may executed with SIMD instructions, take a loop in DoubleColAddDoubleColumn.java for example, {code:java} for (int i = 0; i != n; i++) { outputVector[i] = vector1[0] + vector2[i]; } {code} The "vector1[0]" reference would prevent JVM to execute this part of code with vectorized instructions, we need to assign the "vector1[0]" to a variable outside of loop, and use that variable in loop. -- This message was sent by Atlassian JIRA (v6.3.4#6332)