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Vikram Dixit K updated HIVE-5506: --------------------------------- Status: Patch Available (was: Open) > Hive SPLIT function does not return array correctly > --------------------------------------------------- > > Key: HIVE-5506 > URL: https://issues.apache.org/jira/browse/HIVE-5506 > Project: Hive > Issue Type: Bug > Components: SQL, UDF > Affects Versions: 0.11.0, 0.10.0, 0.9.0 > Environment: Hive > Reporter: John Omernik > Assignee: Vikram Dixit K > Attachments: HIVE-5506.1.patch, HIVE-5506.2.patch > > > Hello all, I think I have outlined a bug in the hive split function: > Summary: When calling split on a string of data, it will only return all > array items if the the last array item has a value. For example, if I have a > string of text delimited by tab with 7 columns, and the first four are > filled, but the last three are blank, split will only return a 4 position > array. If any number of "middle" columns are empty, but the last item still > has a value, then it will return the proper number of columns. This was > tested in Hive 0.9 and hive 0.11. > Data: > (Note \t represents a tab char, \x09 the line endings should be \n (UNIX > style) not sure what email will do to them). Basically my data is 7 lines of > data with the first 7 letters separated by tab. On some lines I've left out > certain letters, but kept the number of tabs exactly the same. > input.txt > a\tb\tc\td\te\tf\tg > a\tb\tc\td\te\t\tg > a\tb\t\td\t\tf\tg > \t\t\td\te\tf\tg > a\tb\tc\td\t\t\t > a\t\t\t\te\tf\tg > a\t\t\td\t\t\tg > I then created a table with one column from that data: > DROP TABLE tmp_jo_tab_test; > CREATE table tmp_jo_tab_test (message_line STRING) > STORED AS TEXTFILE; > > LOAD DATA LOCAL INPATH '/tmp/input.txt' > OVERWRITE INTO TABLE tmp_jo_tab_test; > Ok just to validate I created a python counting script: > #!/usr/bin/python > > import sys > > > for line in sys.stdin: > line = line[0:-1] > out = line.split("\t") > print len(out) > The output there is : > $ cat input.txt |./cnt_tabs.py > 7 > 7 > 7 > 7 > 7 > 7 > 7 > Based on that information, split on tab should return me 7 for each line as > well: > hive -e "select size(split(message_line, '\\t')) from tmp_jo_tab_test;" > > 7 > 7 > 7 > 7 > 4 > 7 > 7 > However it does not. It would appear that the line where only the first four > letters are filled in(and blank is passed in on the last three) only returns > 4 splits, where there should technically be 7, 4 for letters included, and > three blanks. > a\tb\tc\td\t\t\t -- This message was sent by Atlassian JIRA (v6.1#6144)