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https://issues.apache.org/jira/browse/TAJO-838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14227203#comment-14227203
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ASF GitHub Bot commented on TAJO-838:
-------------------------------------
Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/231#discussion_r20977436
--- Diff:
tajo-plan/src/main/java/org/apache/tajo/plan/NamedExprsManager.java ---
@@ -193,11 +193,11 @@ public String addExpr(Expr expr, String alias) throws
PlanningException {
* Adds an expression and returns a reference name.
* If an alias is given, it specifies the alias as an reference name.
*/
- public String addNamedExpr(NamedExpr namedExpr) throws PlanningException
{
+ public String addNamedExpr(NamedExpr namedExpr, boolean identifiable)
throws PlanningException {
if (namedExpr.hasAlias()) {
return addExpr(namedExpr.getExpr(), namedExpr.getAlias());
} else {
- return addExpr(namedExpr.getExpr());
+ return addExpr(namedExpr.getExpr(), identifiable);
--- End diff --
I'll leave a detailed description for the identifiable name, tomorrow.
> Improve query planner to utilize index
> --------------------------------------
>
> Key: TAJO-838
> URL: https://issues.apache.org/jira/browse/TAJO-838
> Project: Tajo
> Issue Type: Sub-task
> Components: planner/optimizer
> Reporter: Jihoon Son
> Assignee: Jihoon Son
> Priority: Minor
>
> Index can improve the query performance when the selectivity of query is high.
> Thus, query planner should decide whether index is used or not for a given
> query.
> The selectivity can be guessed using statistics.
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