Added/Updated tests\bugs\gh_7844_test.py: Confirmed bug on WI-T6.0.0.122. Checked on 6.0.0.124 (intermediate build, timestamp: 14.11.2023 09:00).

tests/bugs/gh_7844_test.py

@@ -0,0 +1,58 @@
+#coding:utf-8
+
+"""
+ID:          issue-7844
+ISSUE:       https://github.com/FirebirdSQL/firebird/issues/7844
+TITLE:       Removing first column with SET WIDTH crashes ISQL
+DESCRIPTION:
+NOTES:
+   [14.11.2023] pzotov
+   There are no crashes on FB 3.x ... 6.x neither on Windows nor on Linux.
+   Crash occurred only in DEBUG build (reply from Adriano, 14.11.2023 12:18).
+   On release build, 'set width a;' caused loose of info about width for column 'b'.
+   Confirmed bug on WI-T6.0.0.122.
+   Checked on 6.0.0.124 (intermediate build, timestamp: 14.11.2023 09:00).
+"""
+
+import pytest
+from firebird.qa import *
+
+db = db_factory()
+
+test_script = """
+    set heading off;
+
+    recreate table test(a varchar(10), b varchar(28));
+
+    insert into test(a,b) values('no special', 'chars must be here!@#$%^&*()');
+    commit;
+
+    set width a 10;
+    set width b 18;
+
+    select 'point-1', t.* from test t;
+
+    -- This caused width of 'b' to be restored to its original size
+    -- (instead of preserving its value to that was specified in 'set with b ...'):
+    set width a;
+
+    select 'point-2', t.* from test t;
+
+    -- crash here, but only in DEBUG build.
+    set width a 10;
+
+    select 'point-3', t.* from test t;
+"""
+expected_stdout = """
+    point-1  no special chars must be here
+    point-2  no special chars must be here
+    point-3  no special chars must be here
+"""
+
+act = isql_act('db', test_script)
+
+@pytest.mark.version('>=3.0.12')
+def test_1(act: Action):
+    act.expected_stdout = expected_stdout
+    act.execute(combine_output = True)
+    assert act.clean_stdout == act.clean_expected_stdout