yiguolei commented on code in PR #2720:
URL: https://github.com/apache/doris-website/pull/2720#discussion_r2262089628
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docs/sql-manual/sql-functions/scalar-functions/variant-functions/element-at.md:
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@@ -0,0 +1,109 @@
+---
+{
+ "title": "ELEMENT_AT",
+ "language": "en"
+}
+---
+
+## Function
+
+The `ELEMENT_AT` function is used to extract the element value from an array
or map based on the specified index or key.
+
+- When applied to an **ARRAY**, it returns the element at the specified
position.
+- When applied to a **MAP**, it returns the value corresponding to the
specified key.
+- When applied to a **VARIANT**, it returns the value of the specified
subfield.
+
+## Syntax
+
+```sql
+ELEMENT_AT(container, key_or_index)
+```
+
+## Parameters
+
+- `container`: Can be `ARRAY`, `MAP`, or `VARIANT`.
+- `key_or_index`:
+ - For `ARRAY`: An integer, with indexing starting from **1**.
+ - For `MAP`: The key type (`K`) of the `MAP`, which can be any supported
primitive type.
+ - For `VARIANT`: A string type.
+
+## Return Value
+
+- For `ARRAY`: Returns the element at the specified index (`T` type).
+- For `MAP`: Returns the value corresponding to the specified key (`V` type).
+- For `VARIANT`: Returns a `VARIANT` type value.
+- If the index or key does not exist, returns `NULL`.
Review Comment:
如果index 超过了size 是什么？
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