Feature: Column alias tables for simplified querying

[SpencerTorres]

Purpose

Some schemas have complicated maps such as OTel LogAttributes. This feature allows configuring a table like this:

CREATE TABLE otel_logs_query_aliases (
    `alias` String,
    `select` String,
    `type` String
)
Engine = MergeTree
ORDER BY (alias);

INSERT INTO otel_logs_query_aliases (`alias`, `select`, `type`) VALUES
('productId', 'LogAttributes[\'productId\']', 'UInt64'),
('quantity', 'LogAttributes[\'quantity\']', 'String'),
('userId', 'LogAttributes[\'userId\']', 'UInt64'),
('code.filepath', 'LogAttributes[\'code.filepath\']', 'String'),
('code.function', 'LogAttributes[\'code.function\']', 'String'),
('code.lineno', 'LogAttributes[\'code.lineno\']', 'Int64'),
. . .

This table can then be configured in the plugin:

And then be used for the target table's column suggestions:

With the column selection simplified, the correct SQL will be generated using the underlying select syntax:

Notes:

• Tables without a matching alias will default to the original DESC TABLE for column suggestions.
• This capability is already built-in to ClickHouse via the ALIAS column type, but this feature allows for easier maintenance without having to run bulk updates on your primary table (some schemas may have thousands of alias entries).

Changes

• added configuration for alias tables
• updated query builder to use a label, which defaults to the field name if an alias doesn't override it.
• added tests for affected files/features
• updated changelog

[SpencerTorres]

The array change you suggested worked locally, I didn't get any errors when unit testing or in-editor, but the build seemed to be failing. I tried updating to a typescript version that supports that extension and it lead to a complete collapse of the plugin's package ecosystem. I think I even saw leftpad mentioned in the logs.

Anyway, let me know if you want me to try again. I want to use that new feature, but there's a lot of dependencies affected by updating TS.