Implemented age_tail function #1013
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Added the age_tail() function, which returns a list containing all the elements, excluding the first one, from a list. It is essentially the same function that openCypher has: https://neo4j.com/docs/cypher-manual/current/functions/list/#functions-tail
regress/expected/expr.out
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| -- should throw errors | ||
| SELECT * FROM cypher('for_tail', $$ RETURN tail(123) $$) AS (tail agtype); | ||
| ERROR: graph "for_tail" does not exist |
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Is it the error we are expecting?
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It was not, because of the wrong name for the graph. Fixed with the new commit.
| agis_result.res = push_agtype_value(&agis_result.parse_state, | ||
| WAGT_END_ARRAY, NULL); | ||
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| PG_RETURN_POINTER(agtype_value_to_agtype(agis_result.res)); |
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Should we free the agtype_value from the memory (i.e. using pfree_agtype_value), since we are not returning it?
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I believe at the time I created this PR we did not have the pfree_agtype_value() function, at least not in utils/adt/agtype_util.c. I will execute the git pull command and then git rebase so that the branch is updated and then make the necessary modifications. I hope you don't mind me asking, but pfree_agtype_value() should be called with which argument?
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I think @rafsun42 might be referring to agis_result.res but that would mean assigning a variable the return value of agtype_value_to_agtype and returning that.
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Ook! I did that and it seems to work fine, but I just had to do it on another branch because I ended up making a mess of a code after git rebase. Is it okay if I create another PR and close this one? Sorry for this.
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@MatheusFarias03 If that is the only way, then you don't have an option.
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Here's the updated PR with all the necessary fixes: #1272
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I have added some curly braces in the if statements. |
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Closing this PR - There's an updated PR that fixes everything. |
Added the age_tail() function, which returns a list containing all the elements, excluding the first one, from a list. It is essentially the same function that openCypher has: https://neo4j.com/docs/cypher-manual/current/functions/list/#functions-tail