Make sql pre-commit check work when pre-commit hooks are in non-standard locations (#14955)

* make sql pre-commit check work with git worktrees

* Comment reasoning in script file

Co-authored-by: Kyle Altendorf <sda@fstab.net>

---------

Co-authored-by: Kyle Altendorf <sda@fstab.net>

tests/check_sql_statements.py

@@ -9,7 +9,13 @@ from typing import Dict, Set, Tuple
 
 
 def check_create(sql_type: str, cwd: str, exemptions: Set[Tuple[str, str]] = set()) -> int:
-    lines = check_output(["git", "grep", f"CREATE {sql_type}"], cwd=cwd).decode("ascii").split("\n")
+    # the need for this change seems to come from the git precommit plus the python pre-commit environment
+    # having GIT_DIR specified but not GIT_WORK_TREE.  this is an issue in some less common git setups
+    # such as with worktrees, at least in particular uses of them.  i think that we could switch to letting
+    # pre-commit provide the file list instead of reaching out to git to build that list ourselves.  until we
+    # make time to handle that, this is an alternative to alleviate the issue.
+    exemptions = set((cwd + "/" + file, name) for file, name in exemptions)
+    lines = check_output(["git", "grep", f"CREATE {sql_type}"]).decode("ascii").split("\n")
 
     ret = 0
 
@@ -21,6 +27,8 @@ def check_create(sql_type: str, cwd: str, exemptions: Set[Tuple[str, str]] = set
             continue
         if "db_upgrade_func.py" in line:
             continue
+        if not line.startswith(cwd):
+            continue
 
         name = line.split(f"CREATE {sql_type}")[1]
         if name.startswith(" IF NOT EXISTS"):