[jira] [Created] (TAJO-614) Explaning a logical node should use ExplainLogicalPlanVisitor.

["Hyunsik Choi (JIRA)" <ji...@apache.org>]

Hyunsik Choi created TAJO-614:
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             Summary: Explaning a logical node should use ExplainLogicalPlanVisitor.
                 Key: TAJO-614
                 URL: https://issues.apache.org/jira/browse/TAJO-614
             Project: Tajo
          Issue Type: Improvement
          Components: planner/optimizer
            Reporter: Hyunsik Choi
            Priority: Minor
             Fix For: 0.8-incubating


Currently, many parts use LogicalNode::toString() for explaning plans. But, we already have ExplainLogicalPlanVisitor class to generate pretty print strings.

This patch improves logical planning related parts to use ExplainLogicalPlanVisitor instead of toString().

For this, I added PlannerUtil::buildExplainString for generating pretty print explain strings and simplified obsolete toString() methods of all LogicalNodes.

It much improves the readability of explain string. I expect that it would be helpful for debugging and users' understanding of query plans.



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