Query: Avoid double explicit casting
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 42/100
Research direction
Start by tracing how the user-defined convert node and aggregate operator produce the shown SQL, focusing on the inner and outer casts. Compare the generated query before and after the change; done means the redundant double explicit cast is condensed while the aggregate type remains preserved on the server.
Written by the indexing model from the issue text.
Description
Average_with_non_matching_types_in_projection_doesnt_produce_second_explicit_cast
Right now we generate SQL like this
SELECT AVG(CAST(CAST([o].[OrderID] AS bigint) AS float))
FROM [Orders] AS [o]
WHERE [o].[CustomerID] LIKE N'A' + N'%' AND (LEFT([o].[CustomerID], LEN(N'A')) = N'A')
Those double casting, we can condense. The inner one comes from user defined convert node. Outer one is to preserve type on server when applying aggregate operator.
- Dominant language
- C#
- Stars
- 14.8k
- Forks
- 3.4k
- Avg merge
- 2d 5h
- Merged PRs (30d)
- 134
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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