psql:/tmp/pgsql_bug_testcase.sql:1: ERROR:  duplicate key violates unique constraint "buggy_uq_i_key"
CONTEXT:  SQL function "bug_case1" statement 4
psql:/tmp/pgsql_bug_testcase.sql:3: ERROR:  duplicate key violates unique constraint "buggy_uq_child_i_key"
CONTEXT:  SQL function "bug_case2" statement 6
 bug_case3
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(1 row)