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insert: don't crash on header-only CSV with --detect-types

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When the input has a header but no data rows, the insert path never
creates the table - the row loop has nothing to feed into the first
insert. The post-insert tracker.transform call then asserts the table
exists and blows up:

    AssertionError: Cannot transform a table that doesn't exist yet

Reported in #702 with the exact fix in the body. Guard the transform
on db[table].exists() so an empty CSV is just a no-op, matching what
--detect-types already does for a zero-byte CSV (no header either).

Closes #702.

Signed-off-by: Charlie Tonneslan <cst0520@gmail.com>
This commit is contained in:
Charlie Tonneslan 2026-05-17 19:54:45 -04:00
commit 33cab5e4ff
2 changed files with 21 additions and 1 deletions
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5
sqlite_utils/cli.py
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@ -1175,7 +1175,10 @@ def insert_upsert_implementation(
)
else:
raise
if tracker is not None:
# An empty CSV (header row but no data rows) never creates the table,
# so there's nothing to transform. Without this guard, --detect-types
# crashes on header-only input (see #702).
if tracker is not None and db[table].exists():
db.table(table).transform(types=tracker.types)
# Clean up open file-like objects