pgsql: Improve new hash partition bound check error messages

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pgsql: Improve new hash partition bound check error messages

Peter Eisentraut-3
Improve new hash partition bound check error messages

For the error message "every hash partition modulus must be a factor
of the next larger modulus", add a detail message that shows the
particular numbers and existing partition involved.  Also comment the
code more.

Reviewed-by: Amit Langote <[hidden email]>
Reviewed-by: Heikki Linnakangas <[hidden email]>
Discussion: https://www.postgresql.org/message-id/flat/bb9d60b4-aadb-607a-1a9d-fdc3434dddcd%40enterprisedb.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/efbfb642414b61db1567a7a902ace3f307d7564a

Modified Files
--------------
src/backend/partitioning/partbounds.c      | 62 +++++++++++++++++++++---------
src/test/regress/expected/alter_table.out  |  1 +
src/test/regress/expected/create_table.out |  2 +
3 files changed, 47 insertions(+), 18 deletions(-)