Steve Ogden created PIG-3720:
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Summary: Nested concats of binary conditionals take 1/2 hour to
parse
Key: PIG-3720
URL: https://issues.apache.org/jira/browse/PIG-3720
Project: Pig
Issue Type: Bug
Components: parser
Affects Versions: 0.10.0
Reporter: Steve Ogden
Priority: Minor
This statement takes over 1/2 hour to parse. Seems to be related to the
conditionals. Removing them and just running the nested concats, it parses fast:
fact_tsgsrtd_dim_hash = foreach tsgsrtd generate checksum,
UPPER(
CONCAT((no_of_rics == '\\N' ? '0' : no_of_rics),
CONCAT(request_start_dttm,
CONCAT(request_end_dttm,
CONCAT((adjs_list == '\\N' ? 'UNKNOWN' : adjs_list),
CONCAT((event_datatype == '\\N' ? 'UNKNOWN' : event_datatype),
CONCAT((facts_list == '\\N' ? 'UNKNOWN' : facts_list),
CONCAT((frequency == '\\N' ? 'UNKNOWN' : frequency),
CONCAT((points == '\\N' ? '0' : points),
CONCAT((multiplier == '\\N' ? '0' : multiplier),
CONCAT((qos == '\\N' ? 'UNKNOWN' : qos),
CONCAT((pe == '\\N' ? '0' : pe),
(event_type == 'GSREQ' ? 'GS' : (event_type == 'RICREQ' ? 'RTD'
: (event_type == 'TSREQ' ? 'TS' : 'UNKNOWN')))
))))))))))));
I noticed it I split it, do half the conditionals in one relation, then take
the results of that and create another relation and do the other half of the
conditionals, it parses in less than a minute:
fact_tsgsrtd_cat1 = foreach tsgsrtd generate checksum, points, multiplier, qos,
pe, event_type,
CONCAT(CONCAT((no_of_rics == '\\N' ? '0' :
no_of_rics),'.000000000'),
CONCAT(request_start_dttm,
CONCAT(request_end_dttm,
CONCAT((adjs_list == '\\N' ? 'UNKNOWN' : adjs_list),
CONCAT((event_datatype == '\\N' ? 'UNKNOWN' : event_datatype),
CONCAT((facts_list == '\\N' ? 'UNKNOWN' : facts_list),
(frequency == '\\N' ? 'UNKNOWN' : frequency)
)))))) as cat1;
fact_tsgsrtd_dim_hash = foreach fact_tsgsrtd_cat1 generate checksum,
UPPER(
CONCAT(cat1,
CONCAT((points == '\\N' ? '0' : points),
CONCAT((multiplier == '\\N' ? '0' : multiplier),
CONCAT((qos == '\\N' ? 'UNKNOWN' : qos),
CONCAT(CONCAT((pe == '\\N' ? '0' : pe), '.0000'),
(event_type == 'GSREQ' ? 'GS' : (event_type == 'RICREQ' ? 'RTD'
: (event_type == 'TSREQ' ? 'TS' : 'UNKNOWN')))
)))))) as ts_dim_hash;
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