Henry Robinson 38befd2126 IMPALA-724: Support infinite / nan values in text files ...

This patch allows the text scanner to read 'inf' or 'Infinity' from a
row and correctly translate it into floating-point infinity. It also
adds is_inf() and is_nan() builtins.

Finally, we change the text table writer to write Infinity and NaN for
compatibility with Hive.

In the future, we might consider adding nan / inf literals to our
grammar (postgres has this, see:
http://www.postgresql.org/docs/9.3/static/datatype-numeric.html).

Change-Id: I796f2852b3c6c3b72e9aae9dd5ad228d188a6ea3
Reviewed-on: http://gerrit.ent.cloudera.com:8080/2393
Reviewed-by: Henry Robinson <henry@cloudera.com>
Tested-by: jenkins
(cherry picked from commit 58091355142cadd2b74874d9aa7c8ab6bf3efe2f)
Reviewed-on: http://gerrit.ent.cloudera.com:8080/2483

2014-05-08 12:28:53 -07:00

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