Parsing Bags by PigStorage is not handled correctly if whitespace before start
of tuple.
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Key: PIG-947
URL: https://issues.apache.org/jira/browse/PIG-947
Project: Pig
Issue Type: Bug
Components: data
Environment: Pig on Hadoop 18
Reporter: Gandul Azul
PigStorage parser for bags is not working correctly when a tuple in a bag is
proceeded by a space. For example, the following is parsed correctly:
{(-5.243084,3.142401,0.000138,2.071200,0),(-6.021349,0.992683,0.000044,0.992683,0),(-10.426160,20.251774,0.000892,5.691086,0)}
while this is not: (Note the space before the second tuple)
{(-5.243084,3.142401,0.000138,2.071200,0),
(-6.021349,0.992683,0.000044,0.992683,0),(-10.426160,20.251774,0.000892,5.691086,0)}
It seems that the parser when it encounters the space, treats the rest of the
line as a String. With a schema, this results in a typecast of string to
databag which results in exception. Accordingly, because of this, when using
pigstorage to output a bag, it cannot be loaded using pigstorage because of
this inconsistency.
|WARN builtin.PigStorage: Unable to interpret value [...@2c9b42e6 in field
being converted to type bag, caught ParseException <Encountered " <STRING> "
"" at |line 1, column 43.
|Was expecting:
| "(" ...
| > field discarded
Below is the parser debug output for the parsing of the above error sequence:
"2.071200,0), (" from above...
****** FOUND A <DOUBLENUMBER> MATCH (2.071200) ******
Call: AtomDatum
Consumed token: <<DOUBLENUMBER>: "2.071200" at line 1 column 31>
Return: AtomDatum
Return: Datum
Matched the empty string as <STRING> token.
Current character : , (44) at line 1 column 39
No more string literal token matches are possible.
Currently matched the first 1 characters as a "," token.
****** FOUND A "," MATCH (,) ******
Consumed token: <"," at line 1 column 39>
Call: Datum
Matched the empty string as <STRING> token.
Current character : 0 (48) at line 1 column 40
No string literal matches possible.
Starting NFA to match one of : { <STRING>, <SIGNEDINTEGER>, <DOUBLENUMBER> }
Current character : 0 (48) at line 1 column 40
Currently matched the first 1 characters as a <SIGNEDINTEGER> token.
Possible kinds of longer matches : { <STRING>, <SIGNEDINTEGER>,
<DOUBLENUMBER>, <LONGINTEGER>,
<FLOATNUMBER> }
Current character : ) (41) at line 1 column 41
Currently matched the first 1 characters as a <SIGNEDINTEGER> token.
Putting back 1 characters into the input stream.
****** FOUND A <SIGNEDINTEGER> MATCH (0) ******
Call: AtomDatum
Consumed token: <<SIGNEDINTEGER>: "0" at line 1 column 40>
Return: AtomDatum
Return: Datum
Matched the empty string as <STRING> token.
Current character : ) (41) at line 1 column 41
No more string literal token matches are possible.
Currently matched the first 1 characters as a ")" token.
****** FOUND A ")" MATCH ()) ******
Return: Tuple
Consumed token: <")" at line 1 column 41>
Matched the empty string as <STRING> token.
Current character : , (44) at line 1 column 42
No more string literal token matches are possible.
Currently matched the first 1 characters as a "," token.
****** FOUND A "," MATCH (,) ******
Consumed token: <"," at line 1 column 42>
Matched the empty string as <STRING> token.
Current character : (32) at line 1 column 43
No string literal matches possible.
Starting NFA to match one of : { <STRING>, <SIGNEDINTEGER>, <DOUBLENUMBER> }
Current character : (32) at line 1 column 43
Currently matched the first 1 characters as a <STRING> token.
Possible kinds of longer matches : { <STRING>, <SIGNEDINTEGER>,
<DOUBLENUMBER> }
Current character : ( (40) at line 1 column 44
Currently matched the first 1 characters as a <STRING> token.
Putting back 1 characters into the input stream.
****** FOUND A <STRING> MATCH ( ) ******
Return: Bag
Return: Datum
Return: Parse
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