> On April 5, 2017, 3:37 p.m., Ashutosh Chauhan wrote:
> > ql/src/java/org/apache/hadoop/hive/ql/parse/IdentifiersParser.g
> > Lines 590-592 (patched)
> > <https://reviews.apache.org/r/58181/diff/2/?file=1684715#file1684715line590>
> >
> > It will be good to not add extra tokens in grammar as it increases the
> > size of state machine. How about:
> >
> >
> > KW_IS (a=KW_NOT)? KW_DISTINCT KW_FROM
> > -> {$a !=null}? ^(EQUAL_NS)
> > -> ^(KW_NOT EQUAL_NS)
>
> Vineet Garg wrote:
> I agree and I tried not to add new tokens but I couldn't figure out how
> to write grammar in such a way to avoid adding it.
>
> For is distinct from we want AST as follows
> KW_NOT
> EQUAL_NS
> Expr1
> Expr2
>
> isDistinctFrom rule is invoked from precedenceEqualOperator which is
> suppose to return an AST for operator. This AST is further used by
> precedenceEqualOperator's invoker to make an AST with returned AST as root
> and with two expression as it's children. So if isDistinctFrom return this AST
> KW_NOT
> EQUAL_NS
>
> invoker of precedenceEqualOperator will end up creating
> KW_NOT
> EQUAL_NS
> Expr1
> Expr2
>
> which is not what we want.
>
> Your above suggestion throws an exception while parsing FAILED:
> RewriteEmptyStreamException token KW_NOT.
>
> I am not sure why
can u try
KW_IS (a=KW_NOT)? KW_DISTINCT KW_FROM
-> {$a !=null}? ^(EQUAL_NS)
-> ^(KW_NOT ^EQUAL_NS)
- pengcheng
-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/58181/#review171125
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On April 6, 2017, 8:02 p.m., Vineet Garg wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/58181/
> -----------------------------------------------------------
>
> (Updated April 6, 2017, 8:02 p.m.)
>
>
> Review request for hive, Ashutosh Chauhan, Jesús Camacho Rodríguez, and
> Pengcheng Xu.
>
>
> Bugs: HIVE-15986
> https://issues.apache.org/jira/browse/HIVE-15986
>
>
> Repository: hive-git
>
>
> Description
> -------
>
> This patch adds support for 'is distinct from' and 'is not distinct from'.
>
>
> Diffs
> -----
>
> itests/src/test/resources/testconfiguration.properties 7a70c9c
> ql/src/java/org/apache/hadoop/hive/ql/exec/FunctionRegistry.java ccfb455
>
> ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/translator/SqlFunctionConverter.java
> 85450c9
> ql/src/java/org/apache/hadoop/hive/ql/parse/HiveParser.g d98a663
> ql/src/java/org/apache/hadoop/hive/ql/parse/IdentifiersParser.g 8c4ee8a
> ql/src/java/org/apache/hadoop/hive/ql/parse/TypeCheckProcFactory.java
> f979c14
> ql/src/test/queries/clientpositive/is_distinct_from.q PRE-CREATION
> ql/src/test/results/clientpositive/llap/is_distinct_from.q.out PRE-CREATION
> ql/src/test/results/clientpositive/show_functions.q.out 68e248a
> ql/src/test/results/clientpositive/udf_equal.q.out 52bd843
>
>
> Diff: https://reviews.apache.org/r/58181/diff/4/
>
>
> Testing
> -------
>
> Added new tests
> Pre-commit testing
>
>
> Thanks,
>
> Vineet Garg
>
>
