docs: cover array + json functions

[bohutang]

Summary

Area	Functions	Notes
Array docs (EN/CN)	ARRAY, ARRAY_ANY, ARRAY_APPROX_COUNT_DISTINCT, ARRAY_AVG, ARRAY_COUNT, ARRAY_GENERATE_RANGE, ARRAY_KURTOSIS, ARRAY_MAX, ARRAY_MEDIAN, ARRAY_MIN, ARRAY_SIZE (aka ARRAY_LENGTH), ARRAY_SKEWNESS, ARRAY_SORT (+ ASC/DESC variants), ARRAY_STDDEV_POP (aka ARRAY_STD), ARRAY_STDDEV_SAMP (aka ARRAY_STDDEV), ARRAY_SUM, ARRAY_TO_STRING	Added concise refs + Databend-verified SQL; mirrored in CN docs; updated array index tables
JSON helpers (EN/CN)	GET_BY_KEYPATH, GET_BY_KEYPATH_STRING, JSON_CONTAINS_IN_LEFT, JSON_CONTAINS_IN_RIGHT, JSON_EXISTS_KEY, JSON_EXISTS_ANY_KEYS, JSON_EXISTS_ALL_KEYS	New pages with examples; JSON index now lists them
Alias wiring	ARRAY_CONSTRUCT↔JSON_ARRAY, ARRAY_DISTINCT↔JSON_ARRAY_DISTINCT, ARRAY_EXCEPT, ARRAY_INSERT, ARRAY_INTERSECTION, ARRAY_OVERLAP, OBJECT_*↔JSON_OBJECT_*, STRIP_NULL_VALUE↔JSON_STRIP_NULLS, GET↔GET_STRING, JSON_ARRAY_AGG↔JSON_AGG	Added title_includes so aliases share the same reference
JSON index	Added containment/exists section (EN & CN)

Testing

• Verified SQL examples via Databend MCP

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Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ready	Preview	Comment	Nov 7, 2025 1:27am

[bohutang]

cc @b41sh