feat: Support $eq query for liveQuery

[sadakchap]

New Feature / Enhancement Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.

Current Limitation

As per this issue, currently it is not possible to combine equalTo clause with any other clauses and vice-versa. After adding support for combining equalTo clause with other clauses in Parse-SDK-JS's pr.

We need to add support equalTo for LiveQuery, so that it triggers correct events for client.

Feature / Enhancement Description

We would need to add support for $eq query in LiveQuery's matchKeyConstraints.

Example Use Case

let q = new Parse.Query('MyClass');
q.equalTo('age', null);
q.exists('age');
// if final query would be like 
// where: { age: { $eq: null, $exists: true } }
const subscribe = await q.subscribe();

Alternatives / Workarounds

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3rd Party References

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[parse-github-assistant]

Thanks for opening this issue!

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[cbaker6]

Looks related to #7227 (comment)

In the discussion, there are ways to do equalTo in LiveQuery without $eq which are linked in the discussion.

[parseplatformorg]

🎉 This change has been released in version 6.1.0-alpha.18

[parseplatformorg]

🎉 This change has been released in version 6.3.0-beta.1

[parseplatformorg]

🎉 This change has been released in version 6.3.0-alpha.1

[parseplatformorg]

🎉 This change has been released in version 6.3.0