[HIVE-10238] Loop optimization for SIMD in IfExprColumnColumn.txt

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.1.0
• Fix Version/s: 2.0.0
• Component/s: Vectorization
• Assignee: Teddy Choi
• Reporter: Chengxiang Li
• Created: 07/Apr/15 08:56
• Updated: 16/Feb/16 23:51
• Resolved: 23/Sep/15 17:45

Description

The ?: operator as following could not be vectorized in loop, we may transfer it into mathematical expression.

for(int j = 0; j != n; j++) {
      int i = sel[j];
      outputVector[i] = (vector1[i] == 1 ? vector2[i] : vector3[i]);
      outputIsNull[i] = (vector1[i] == 1 ?
          arg2ColVector.isNull[i] : arg3ColVector.isNull[i]);
}