pgsql: WITH TIES: number of rows is optional and defaults to one

WITH TIES: number of rows is optional and defaults to one

FETCH FIRST .. ONLY implements this correctly, but we missed to include
it for FETCH FIRST .. WITH TIES in commit 357889eb17bb.

Author: Vik Fearing
Discussion: https://postgr.es/m/6aa690ef-551d-e24f-2690-c38c2442947c@postgresfriends.org

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/c301c2e739c642199f9e4c62d867dc7bd5ef0fd1

Modified Files
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src/backend/parser/gram.y           |  8 ++++++++
src/test/regress/expected/limit.out | 17 +++++++++++++++++
src/test/regress/sql/limit.sql      |  5 +++++
3 files changed, 30 insertions(+)