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Docs: Mention behavior change of splitByChar() in v22.11, see #42673

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Robert Schulze 2023-09-10 14:12:12 +00:00
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docs/en/sql-reference/functions/splitting-merging-functions.md
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@ -33,6 +33,13 @@ Returns an array of selected substrings. Empty substrings may be selected when:
Type: [Array](../../sql-reference/data-types/array.md)([String](../../sql-reference/data-types/string.md)).
:::note
The behavior of parameter `max_substrings` changed starting with ClickHouse v22.11. In versions older than that, `max_substrings` > 0 meant that `max_substring`-many splits were performed and that the remainder of the string was returned as the final element of the list.
For example,
- in v22.10: `SELECT splitByChar('=', 'a=b=c=d', 2); -- ['a','b','c=d']`
- in v22.11: `SELECT splitByChar('=', 'a=b=c=d', 2); -- ['a','b']`
:::
**Example**
``` sql
@ -63,7 +70,6 @@ splitByString(separator, s[, max_substrings]))
- `s` — The string to split. [String](../../sql-reference/data-types/string.md).
- `max_substrings` — An optional `Int64` defaulting to 0. When `max_substrings` > 0, the returned substrings will be no more than `max_substrings`, otherwise the function will return as many substrings as possible.
**Returned value(s)**
Returns an array of selected substrings. Empty substrings may be selected when: