apache / apache/datafusion

Convert list operator to function in `sql_expr_to_logical_expr`

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#8,506 2 comments 1 reaction 0 assignees View on GitHub
Dominant language
Rust
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Description

Like what we have done for `[] -> MakeArray`.
It is possible to have the similar conversion for other List Operator in the early stage (Sql to LogicExpr).

- List || List -> array_concat #8636
- List || non-List -> array_append #8636
- non-List || List -> array_prepend #8636

TODO
- left <@ right -> array_has_all(right, left)
- left @> right -> array_has_all(left, right)
- list && list -> array_intersect #8496

Other: clean up list/array coercion in `datafusion/expr/src/type_coercion/binary.rs`

_Originally posted by @viirya in https://github.com/apache/arrow-datafusion/pull/8496#discussion_r1423031611_

Contributor guide

Open the contributing guide

Research direction

Start at sql_expr_to_logical_expr and compare the existing [] -> MakeArray conversion with the listed TODO mappings. Review datafusion/expr/src/type_coercion/binary.rs for the related list/array coercion cleanup, using PRs #8636 and #8496 as context. Done means the specified list operators convert to the corresponding array functions.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust, sql
Domain
databases
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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