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Subquery in expressions support

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#298 2 comments 6 reactions 0 assignees View on GitHub

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
25/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
php, sql
Domain
compilers

Research direction

Start by examining the existing expression-parsing path and the regular parser described in the examples. Determine how a separate ExpressionParser could represent and extract subqueries while preserving compatibility, then verify the SELECT and WHERE IN examples produce usable parsed subqueries.

Written by the indexing model from the issue text.

Description

bug enhancement

It seems to subqueries are poorly supported

Some examples first:

They are not parsed at all
SELECT * FROM (SELECT * FROM b) a

results in

...
PhpMyAdmin\SqlParser\Components\Expression Object
(
    [database] =>
    [table] =>
    [column] =>
    [expr] => (SELECT * FROM b)
    [alias] => a
    [function] =>
    [subquery] => SELECT
)
...
not even extracted properly (see #254)
SELECT * FROM a WHERE a.field IN (SELECT * FROM b)

results in

...
...
PhpMyAdmin\SqlParser\Components\Condition Object
(
    [identifiers] => Array
        (
            [0] => a
            [1] => field
            [2] => b
        )

    [isOperator] =>
    [expr] => a.field IN (SELECT * FROM b)
)
...

So I have an idea. May be there must be separate ExpressionParser generating AST for expression? Those (including me) who needed parsed expression can use it (and extract subselects, and parse it with regular parser), and there will be no compatibility break.

Does it sounds as a good plan? If it does, I would like to implement it.

Dominant language
PHP
Stars
485
Forks
119
PR merge metrics
No merged PRs in 30d

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