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Database: Add autoincrement, uniqueness, and sync-writes polyfills #28

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merged 4 commits into from
Jun 24, 2024

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amotl
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@amotl amotl commented Jan 16, 2024

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Add a few polyfills conceived on behalf of the LangChain adapter, and patches to rdflib-sqlalchemy as well as meltano-target-cratedb. By adding them here, they can be used by downstream applications without needing to install cratedb-toolkit.

Documentation

Preview: https://sqlalchemy-cratedb--28.org.readthedocs.build/support.html

@simonprickett: I would also be happy about your review on documentation syntax/grammar/wording, as I am not an English native speaker. Thanks!

References

Backlog

  • Software tests.
  • Documentation.

@amotl amotl force-pushed the amo/polyfill branch 4 times, most recently from 9cc237c to 8158fa6 Compare June 18, 2024 23:01
@amotl amotl force-pushed the amo/polyfill branch 4 times, most recently from 6b65a19 to 600f8ac Compare June 19, 2024 01:33
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@matriv matriv left a comment

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Thx @amotl !
Nice stuff, left some suggestions on the documentation.

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@matriv matriv left a comment

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thx! LGTM, but please wait for one more review.

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The package bundles a few support and utility functions that try to fill a few
gaps you will observe when working with CrateDB, when compared with other
databases. As a distributed OLAP database, it naturally does not include certain
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I think that we shouldn't mention as a distributed OLAP, specially combining it with naturally after that, I would simplify and say that CrateDB's behavior and features deviate from those found usually in an RDBMS.

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Maybe something like "Due to its distributed nature, CrateDB's behavior and features differ from those found in other RDBMS systems".

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which enable automatically assigning incremental values when inserting records.
However, it offers server-side support by providing an SQL function to generate
random identifiers of ``STRING`` type, and client-side support for generating
``INTEGER``-based identifiers on behalf of the SQLAlchemy dialect.
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Not sure what "on behalf of" means here - does this mean "when using the SQLAlchemy dialect" or something else? "on behalf of" implies there's some ID generating function that can be plugged into SQLAlchemy. I don't know SQLAlchemy so am not sure what happens here.

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"when using the SQLAlchemy dialect" is better. Thanks.

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Left a couple of small suggestions.

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amotl commented Jun 24, 2024

@matriv and @simonprickett: Thanks a stack for your excellent reviews. 💯

@amotl amotl merged commit 1549fe6 into main Jun 24, 2024
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@amotl amotl deleted the amo/polyfill branch June 24, 2024 14:27
Comment on lines +111 to +113
full_table_name = f'"{clauseelement.table.name}"'
if clauseelement.table.schema is not None:
full_table_name = f'"{clauseelement.table.schema}".' + full_table_name
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I think I'd prefer moving this quoting logic into the refresh_tablefunction, by change it's signature to consume an optional schema. This would avoid that it will be called with unquoted or invalid relation names.

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Should work. Thanks!

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4 participants