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https://issues.apache.org/jira/browse/DRILL-7763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17161031#comment-17161031
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ASF GitHub Bot commented on DRILL-7763:
---------------------------------------
vvysotskyi commented on a change in pull request #2092:
URL: https://github.com/apache/drill/pull/2092#discussion_r457178768
##########
File path:
exec/java-exec/src/test/java/org/apache/drill/exec/metastore/TestMetastoreWithEasyFormatPlugin.java
##########
@@ -1079,14 +1079,14 @@ public void testFilesPruningWithLimit() throws
Exception {
queryBuilder()
.sql("select * from dfs.tmp.`%s` limit 1", tableName)
.planMatcher()
- .include("Limit", "numFiles=1,")
+ .include("Limit", "numFiles=12,")
Review comment:
This is the regression I mentioned in the previous comment. It is
non-optimal to read all 12 files instead of the single one.
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/store/dfs/easy/EasyGroupScan.java
##########
@@ -172,6 +175,26 @@ private EasyGroupScan(final EasyGroupScan that) {
mappings = that.mappings;
partitionDepth = that.partitionDepth;
metadataProvider = that.metadataProvider;
+ maxRecords = that.maxRecords;
+ supportsLimitPushdown =
that.formatPlugin.easyConfig().supportsLimitPushdown;
+ }
+
+ // Constructor to get the limit pushed down
+ private EasyGroupScan(final EasyGroupScan that, int maxRecords) {
Review comment:
Please do not introduce the new constructor. `maxRecords` is not final,
so it is possible to assign its value after using the existing copy constructor.
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/store/dfs/easy/EasyGroupScan.java
##########
@@ -17,31 +17,30 @@
*/
package org.apache.drill.exec.store.dfs.easy;
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.List;
-
+import com.fasterxml.jackson.annotation.JacksonInject;
Review comment:
Please keep the original imports order.
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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: 1.18.0
>
>
> 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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