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docs: clarify NULL handling for array_remove functions (#21014) #21018

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Merged
comphead merged 4 commits into from
Mar 22, 2026
Merged

docs: clarify NULL handling for array_remove functions (#21014) #21018

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a846f65
docs: clarify NULL handling for array_remove functions (#21014)
Xavrir Mar 18, 2026
0b3ea0f
Merge branch 'main' into docs/issue-21014-array-null-handling
Xavrir Mar 18, 2026
38fa468
docs: trim duplicated tests from array_remove docs PR
Xavrir Mar 18, 2026
fe407bc
style: format expressions.md with prettier
Xavrir Mar 22, 2026
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35 changes: 28 additions & 7 deletions datafusion/functions-nested/src/remove.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -40,13 +40,13 @@ make_udf_expr_and_func!(
ArrayRemove,
array_remove,
array element,
"removes the first element from the array equal to the given value.",
"removes the first element from the array equal to the given value. NULL elements already in the array are preserved when removing a non-NULL value. If `element` evaluates to NULL, the result is NULL rather than removing NULL entries.",
array_remove_udf
);

#[user_doc(
doc_section(label = "Array Functions"),
description = "Removes the first element from the array equal to the given value.",
description = "Removes the first element from the array equal to the given value. NULL elements already in the array are preserved when removing a non-NULL value. If `element` evaluates to NULL, the result is NULL rather than removing NULL entries.",
syntax_example = "array_remove(array, element)",
sql_example = r#"```sql
> select array_remove([1, 2, 2, 3, 2, 1, 4], 2);
Expand All @@ -55,6 +55,13 @@ make_udf_expr_and_func!(
+----------------------------------------------+
| [1, 2, 3, 2, 1, 4] |
+----------------------------------------------+

> select array_remove([1, 2, NULL, 2, 4], 2);
+---------------------------------------------------+
| array_remove(List([1,2,NULL,2,4]),Int64(2)) |
+---------------------------------------------------+
| [1, NULL, 2, 4] |
+---------------------------------------------------+
```"#,
argument(
name = "array",
Expand Down Expand Up @@ -130,21 +137,28 @@ make_udf_expr_and_func!(
ArrayRemoveN,
array_remove_n,
array element max,
"removes the first `max` elements from the array equal to the given value.",
"removes the first `max` elements from the array equal to the given value. NULL elements already in the array are preserved when removing a non-NULL value. If `element` evaluates to NULL, the result is NULL rather than removing NULL entries.",
array_remove_n_udf
);

#[user_doc(
doc_section(label = "Array Functions"),
description = "Removes the first `max` elements from the array equal to the given value.",
syntax_example = "array_remove_n(array, element, max))",
description = "Removes the first `max` elements from the array equal to the given value. NULL elements already in the array are preserved when removing a non-NULL value. If `element` evaluates to NULL, the result is NULL rather than removing NULL entries.",
syntax_example = "array_remove_n(array, element, max)",
sql_example = r#"```sql
> select array_remove_n([1, 2, 2, 3, 2, 1, 4], 2, 2);
+---------------------------------------------------------+
| array_remove_n(List([1,2,2,3,2,1,4]),Int64(2),Int64(2)) |
+---------------------------------------------------------+
| [1, 3, 2, 1, 4] |
+---------------------------------------------------------+

> select array_remove_n([1, 2, NULL, 2, 4], 2, 2);
+----------------------------------------------------------+
| array_remove_n(List([1,2,NULL,2,4]),Int64(2),Int64(2)) |
+----------------------------------------------------------+
| [1, NULL, 4] |
+----------------------------------------------------------+
```"#,
argument(
name = "array",
Expand Down Expand Up @@ -225,13 +239,13 @@ make_udf_expr_and_func!(
ArrayRemoveAll,
array_remove_all,
array element,
"removes all elements from the array equal to the given value.",
"removes all elements from the array equal to the given value. NULL elements already in the array are preserved when removing a non-NULL value. If `element` evaluates to NULL, the result is NULL rather than removing NULL entries.",
array_remove_all_udf
);

#[user_doc(
doc_section(label = "Array Functions"),
description = "Removes all elements from the array equal to the given value.",
description = "Removes all elements from the array equal to the given value. NULL elements already in the array are preserved when removing a non-NULL value. If `element` evaluates to NULL, the result is NULL rather than removing NULL entries.",
syntax_example = "array_remove_all(array, element)",
sql_example = r#"```sql
> select array_remove_all([1, 2, 2, 3, 2, 1, 4], 2);
Expand All @@ -240,6 +254,13 @@ make_udf_expr_and_func!(
+--------------------------------------------------+
| [1, 3, 1, 4] |
+--------------------------------------------------+

> select array_remove_all([1, 2, NULL, 2, 4], 2);
+-----------------------------------------------------+
| array_remove_all(List([1,2,NULL,2,4]),Int64(2)) |
+-----------------------------------------------------+
| [1, NULL, 4] |
+-----------------------------------------------------+
```"#,
argument(
name = "array",
Expand Down
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