queryExprMap need ability for user to register customized buildexperession

[alingse]

今天刚看到你们的 repo，看了下大致思路，感觉所见略同。
(打个广告, 😂 推荐一下这个 repo https://github.com/alingse/structquery 是类似的实现 )

Describe the feature

need Exposed function to add more func to queryExprMap

Motivation

1. like some json-support query json_contains(field, cast(? as JSON))

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