[Improvement][API&DAO] Unnecessary Large Text Fields Returned in TaskInstanceMapper Queries

[njnu-seafish]

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Description

In TaskInstanceMapper.xml , all queries use which returns the complete set of fields, including multiple text/longtext type large fields :

Avoid returning unnecessary large text fields in TaskInstanceMapper queries. Due to the huge data volume in the task instance table, removing these fields from queries significantly boosts API execution performance.

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• Yes I am willing to submit a PR!

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