#! /bin/sh

# Script to generate test cases for IGNORE NULLS option of some window
# functions (lead, lag, first_value, last_value, and nth_value) in the
# regression test SQL (window.sql).  This script supposed to read
# window.sql from stdin and inserts "ignore null" before "over" on all
# occurrences of the window functions that accept IGNORE NULLS, then
# print it to stdout.  Since currently the data set used for the
# existing regression test (window.sql) does not include NULLs, the
# test result using the results of this script is expected be
# identical to the existing results of existing window.sql (of course
# except the SQL statements).
sed -r \
    -e "s/lead\(([^)]*)\) over/lead(\1) ignore nulls over/g" \
    -e "s/lag\(([^)]*)\) over/lag(\1) ignore nulls over/g" \
    -e "s/first_value\(([^)]*)\) over/first_value(\1) ignore nulls over/g" \
    -e "s/last_value\(([^)]*)\) over/last_value(\1) ignore nulls over/g" \
    -e "s/nth_value\(([^)]*)\) over/nth_value(\1) ignore nulls over/g"