[
https://issues.apache.org/jira/browse/HIVE-21924?focusedWorklogId=325827&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-325827
]
ASF GitHub Bot logged work on HIVE-21924:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 09/Oct/19 17:11
Start Date: 09/Oct/19 17:11
Worklog Time Spent: 10m
Work Description: sankarh commented on pull request #791: HIVE-21924
URL: https://github.com/apache/hive/pull/791#discussion_r333131008
##########
File path:
ql/src/test/queries/clientpositive/file_with_header_footer_aggregation.q
##########
@@ -0,0 +1,94 @@
+set hive.mapred.mode=nonstrict;
+
+dfs ${system:test.dfs.mkdir} ${system:test.tmp.dir};
+dfs -copyFromLocal ../../data/files/header_footer_table_4
${system:test.tmp.dir}/header_footer_table_4;
+
+CREATE TABLE numbrs (numbr int);
+INSERT INTO numbrs VALUES (1), (2), (3), (4), (5), (6), (7), (8), (9), (10),
(11), (12), (NULL);
+CREATE EXTERNAL TABLE header_footer_table_4 (header_int int, header_name
string, header_choice varchar(10)) ROW FORMAT DELIMITED FIELDS TERMINATED BY
',' LOCATION '${system:test.tmp.dir}/header_footer_table_4' tblproperties
("skip.header.line.count"="1", "skip.footer.line.count"="2");
Review comment:
ok... got it.
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Issue Time Tracking
-------------------
Worklog Id: (was: 325827)
Time Spent: 4.5h (was: 4h 20m)
> Split text files even if header/footer exists
> ---------------------------------------------
>
> Key: HIVE-21924
> URL: https://issues.apache.org/jira/browse/HIVE-21924
> Project: Hive
> Issue Type: Improvement
> Components: File Formats
> Affects Versions: 2.4.0, 4.0.0, 3.2.0
> Reporter: Prasanth Jayachandran
> Assignee: Mustafa Iman
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-21924.2.patch, HIVE-21924.3.patch,
> HIVE-21924.4.patch, HIVE-21924.5.patch, HIVE-21924.6.patch, HIVE-21924.patch
>
> Time Spent: 4.5h
> Remaining Estimate: 0h
>
> https://github.com/apache/hive/blob/967a1cc98beede8e6568ce750ebeb6e0d048b8ea/ql/src/java/org/apache/hadoop/hive/ql/io/HiveInputFormat.java#L494-L503
>
> {code}
> int headerCount = 0;
> int footerCount = 0;
> if (table != null) {
> headerCount = Utilities.getHeaderCount(table);
> footerCount = Utilities.getFooterCount(table, conf);
> if (headerCount != 0 || footerCount != 0) {
> // Input file has header or footer, cannot be splitted.
> HiveConf.setLongVar(conf, ConfVars.MAPREDMINSPLITSIZE,
> Long.MAX_VALUE);
> }
> }
> {code}
> this piece of code makes the CSV (or any text files with header/footer) files
> not splittable if header or footer is present.
> If only header is present, we can find the offset after first line break and
> use that to split. Similarly for footer, may be read few KB's of data at the
> end and find the last line break offset. Use that to determine the data range
> which can be used for splitting. Few reads during split generation are
> cheaper than not splitting the file at all.
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