[jira] [Commented] (DRILL-7763) Add Limit Pushdown to File Based Storage Plugins

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-7763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17215670#comment-17215670 ] 

ASF GitHub Bot commented on DRILL-7763:
---------------------------------------

cgivre commented on a change in pull request #2092:
URL: https://github.com/apache/drill/pull/2092#discussion_r506735879



##########
File path: contrib/format-spss/src/test/java/org/apache/drill/exec/store/spss/TestSpssReader.java
##########
@@ -108,7 +108,7 @@ public void testStarQuery() throws Exception {
 
   @Test
   public void testExplicitQuery() throws Exception {
-    String sql = "SELECT ID, Urban, Urban_value FROM dfs.`spss/testdata.sav` WHERE d16=4";
+    String sql = "SELECT ID, Urban, Urban_value FROM dfs.`spss/testdata.sav` WHERE d16=4 LIMIT 5";

Review comment:
       Fixed.




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> Add Limit Pushdown to File Based Storage Plugins
> ------------------------------------------------
>
>                 Key: DRILL-7763
>                 URL: https://issues.apache.org/jira/browse/DRILL-7763
>             Project: Apache Drill
>          Issue Type: Improvement
>    Affects Versions: 1.17.0
>            Reporter: Charles Givre
>            Assignee: Charles Givre
>            Priority: Major
>             Fix For: 1.19.0
>
>
> As currently implemented, when querying a file, Drill will read the entire file even if a limit is specified in the query.  This PR does a few things:
>  # Refactors the EasyGroupScan, EasySubScan, and EasyFormatConfig to allow the option of pushing down limits.
>  # Applies this to all the EVF based format plugins which are: LogRegex, PCAP, SPSS, Esri, Excel and Text (CSV). 
> Due to JSON's fluid schema, it would be unwise to adopt the limit pushdown as it could result in very inconsistent schemata.



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