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fix: don't break the JSON export on a single quote in the path - #1146
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Exporting to JSON failed with a duckdb Parser Error whenever the
destination path held a single quote, so a folder like `Bob's exports`
could not be written into. The two free-text format options had the same
problem: a Date Format of `'%Y'` came back as a Catalog Error.
`_export_json` in src/harlequin/export.py is the only writer that reaches
duckdb as SQL text rather than through a binding, and it built the whole
statement with f-strings: `to '{dest_path}'`, `DATEFORMAT '{...}'` and
`TIMESTAMPFORMAT '{...}'`. A single quote in any of the three ends the
literal it sits in, and the rest of the statement no longer parses.
The statement now binds its values: `copy (select * from data) to ?`,
with `COMPRESSION ?`, `DATEFORMAT ?` and `TIMESTAMPFORMAT ?` appended for
the options that were set. `ARRAY TRUE` stays inline, since it is a fixed
keyword rather than a value.
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CI is red here on two macOS jobs, and neither failure is this PR's. Both are in The same failure is red on It lands on a different job each run, which is what a race looks like rather than a break:
Always macOS, never Linux or Windows, always that one file. The other 13 jobs pass on every run, Static Analysis and Validate Plugin included. There is no fix to port — no open PR addresses it — so there is nothing to bring into this branch, and it wants its own change rather than being repaired from inside an export fix. Re-running would move which job is red, not settle whose it is. What does hold for the export change: (The Generated by Claude Code |
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2 participants
Supersedes #1142, which is @MaxFreedomPollard's work rebased onto
mainunchanged. The commit keeps their authorship; this PR exists only because the branch lives on their fork and could not be pushed to from here. #1142 closes when this merges.No existing issue — the bug was found reading
export.py, so the CHANGELOG entry references none.What are the key elements of this solution?
Exporting a query to JSON failed with a duckdb Parser Error whenever the destination path held a single quote, so a folder called
Bob's exportscould not be exported into.json,jsonlandndjsonwere affected;csv,tsv,parquet,orcandfeatherwrite into that same folder fine. The two free-text JSON options had it too: a Date Format of'%Y'came back asCatalog Error: Type with name Y does not exist!._export_jsonis the one writer that reaches duckdb as SQL text rather than through a binding, and it built the whole statement with f-strings: the destination asto '{dest_path}', and the options asDATEFORMAT '{...}'andTIMESTAMPFORMAT '{...}'. A single quote in any of the three ends the literal it sits in, and the rest of the statement no longer parses.The statement now binds its values:
copy (select * from data) to ?, withCOMPRESSION ?,DATEFORMAT ?andTIMESTAMPFORMAT ?appended for the options that were set.ARRAY TRUEstays inline, since it is a fixed keyword rather than a value.Two regression tests.
TestDestinationPaths::test_a_quote_in_the_path_is_part_of_the_namewrites into aBob's exportsfolder for every one of the nine formats, so the assertion is that no writer is special about what a file may be called; onmainthe six non-JSON formats already pass it andjson,jsonlandndjsonfail.TestJsonOptions::test_a_quote_in_a_format_string_is_part_of_the_formatpasses'%Y'and'%H:%M'and reads the quotes back out of the JSON.Why did you design your solution this way? Did you assess any alternatives? Are there tradeoffs?
(From the original PR.) Doubling the quotes (
dest_path.replace("'", "''")) fixes the same three cases, but it puts a hand-rolled SQL escaper in a module where the other four writers hand duckdb and pyarrow their arguments directly. Binding is what those writers effectively do, and it is why csv and parquet never had this.COMPRESSIONis bound as well, so no value is pasted into the statement any more; it was checked behavior-neutral first — for each of the four choices the JSON format declares (auto,gzip,zstd,uncompressed), writing toout.jsonand toout.json.gzgives byte-identical files whether the codec is a bare token or a bound parameter, extension detection underautoincluded.The
hsqlside is only reachable on a machine whose temp directory holds a quote, sincewrite_stream()writes intotempfile.TemporaryDirectory()and copies the bytes out. The Data Exporter is where a user picks the path, so that is where this bites.Does this PR require a change to Harlequin's docs?
Did you add or update tests for this change?
Verification of the rebase, on this branch:
uv run pytest tests/unit_tests/test_export.py: 117 passed.uv run pytest -m "not online": 1821 passed, 11 failed, 2 errors — every one of those 13 reproduces identically on unmodifiedmainin this container (test_hsql.py,test_config_schema.py,test_config_wizard.py,test_import_hygiene.py), so none is this change's.test_ssh_recovery.py::test_a_refresh_that_reconnects_does_not_ask_for_a_second_one, is a pre-existing flake: it failed onmainitself at 58e3e40 (macOS 3.11) with this change nowhere in the tree.Please complete the following checklist:
CHANGELOG.md, under the[Unreleased]section heading.🤖 Generated with Claude Code
https://claude.ai/code/session_01EUP3KxZA5scpUDqZdozAjF
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