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Parser fails for updates that include subqueries for source tables

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#269 4 comments 0 reactions 0 assignees View on GitHub

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Assessment

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

Research direction

Start by running the supplied UPDATE query through the SQL parser and compare its output with the expected table, subquery, SET, and WHERE structure shown in the issue. Trace how UPDATE table references containing a subquery are tokenized and parsed, then add or update a regression test for this query and verify the parsed structure.

Written by the indexing model from the issue text.

Description

bug

The SQL Parser fails to parse the following query:

update `table1` as e, (select * from table2) e2
set
e.`id` = e2.id,
where e.id=e2.id

It returns the output below. This appears to always be an issue when using subqueries in the table references.

[
    {
        "tables": [
            {
                "database": null,
                "table": "table1",
                "column": null,
                "expr": "`table1`",
                "alias": "e",
                "function": null,
                "subquery": null
            }
        ],
        "set": null,
        "where": null,
        "order": null,
        "limit": null,
        "options": {
            "options": []
        },
        "first": 0,
        "last": 10
    },
    {
        "expr": [
            {
                "database": null,
                "table": null,
                "column": null,
                "expr": "*",
                "alias": null,
                "function": null,
                "subquery": null
            }
        ],
        "from": [
            {
                "database": null,
                "table": "table2",
                "column": null,
                "expr": "table2",
                "alias": null,
                "function": null,
                "subquery": null
            }
        ],
        "index_hints": null,
        "partition": null,
        "where": null,
        "group": null,
        "having": null,
        "order": null,
        "limit": null,
        "procedure": null,
        "into": null,
        "join": null,
        "union": [],
        "end_options": null,
        "options": {
            "options": []
        },
        "first": 11,
        "last": 21
    },
    {
        "options": {
            "options": []
        },
        "end_options": null,
        "set": [
            {
                "column": "e.`id`",
                "value": "e2.id"
            }
        ],
        "first": 22,
        "last": 44,
        "where": [
            {
                "identifiers": [
                    "e",
                    "id",
                    "e2"
                ],
                "isOperator": false,
                "expr": "e.id=e2.id"
            }
        ]
    }
]
Dominant language
PHP
Stars
485
Forks
119
PR merge metrics
No merged PRs in 30d

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