Add a graph pattern variable only once

An element pattern variable may be repeated in the path pattern.
GraphTableParseState maintains a list of all variable names used in
the graph pattern.  Add a new variable name to that list only when it
is not present already.  This isn't a problem right now, but it could
be in the future.

Author: Ashutosh Bapat <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/CAExHW5tR4O0vjeqTCPr2VB5pYjNYbJgbCBEQf63NtU5Pz1MiOQ%40mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/288ae968726ebaca587a446041fe0e0a6377562d

Modified Files
--------------
src/backend/parser/parse_graphtable.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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