Github user DaveBirdsall commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/837#discussion_r89910126
--- Diff:
docs/sql_reference/src/asciidoc/_chapters/sql_functions_and_expressions.adoc ---
@@ -3658,12 +3658,10 @@ IS_IPV4( expression )
* `_expression_`
+
specifies an expression that determines the values to include in the
-computation of the minimum. The _expression_ cannot contain an aggregate
-function or a subquery. The DISTINCT clause specifies that the MIN
-function operates on distinct values from the one-column table derived
-from the evaluation of _expression_. All nulls are eliminated before
-the function is applied to the set of values. If the result table is
-empty, IS_IPV4 returns NULL.
+validation of the IP address. The _expression_ cannot contain an aggregate
+function or a subquery. All nulls are eliminated before the function is
+applied to the set of values. If the result table is empty, IS_IPV4
--- End diff --
The last two sentences appear to be discussing sets or tables of values,
but IS_IPV4 just takes a single value. Consider replacing "All nulls... returns
NULL" with "If the input value is NULL, IS_IPV4 returns NULL." Incidentally,
just for fun I tried doing select is_ipv4(max(b)) from temp1, where temp1 is a
table containing a char column b, and I got an assertion failure.
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