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[7.13] [DOCS] SQL: Move null handling to arg descriptions (#74255) #74262

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Jun 17, 2021
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[7.13] [DOCS] SQL: Move null handling to arg descriptions (#74255) #74262

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27 changes: 16 additions & 11 deletions docs/reference/sql/functions/string.asciidoc
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Original file line number Diff line number Diff line change
Expand Up @@ -58,11 +58,12 @@ CHAR(code) <1>
--------------------------------------------------
*Input*:

<1> integer expression. If `null` or negative, the function returns `null`.
<1> integer expression between `0` and `255`. If `null`, negative, or greater
than `255`, the function returns `null`.

*Output*: string

*Description*: Returns the character that has the ASCII code value specified by the numeric input. The value should be between 0 and 255; otherwise, the return value is data source–dependent.
*Description*: Returns the character that has the ASCII code value specified by the numeric input.

[source, sql]
--------------------------------------------------
Expand Down Expand Up @@ -102,12 +103,12 @@ CONCAT(
--------------------------------------------------
*Input*:

<1> string expression
<2> string expression
<1> string expression. Treats `null` as an empty string.
<2> string expression. Treats `null` as an empty string.

*Output*: string

*Description*: Returns a character string that is the result of concatenating `string_exp1` to `string_exp2`. `null` input strings are treated as empty strings.
*Description*: Returns a character string that is the result of concatenating `string_exp1` to `string_exp2`.

[source, sql]
--------------------------------------------------
Expand Down Expand Up @@ -223,13 +224,17 @@ LOCATE(
--------------------------------------------------
*Input*:

<1> string expression
<2> string expression
<3> integer expression; optional
<1> string expression. If `null`, the function returns `null`.
<2> string expression. If `null`, the function returns `null`.
<3> integer expression; optional. If `null`, `0`, `1`, negative, or not
specified, the search starts at the first character position.

*Output*: integer

*Description*: Returns the starting position of the first occurrence of `pattern` within `source`. The optional `start` specifies the character position to start the search with. The first character position in `source` is indicated by the value 1. Not specifying `start` or specifying it as `null`, any negative value, 0 or 1, starts the search at the first character position. If `pattern` is not found within `source`, the value 0 is returned.
*Description*: Returns the starting position of the first occurrence of
`pattern` within `source`. The optional `start` specifies the character position
to start the search with. If the `pattern` is not found within `source`, the
function returns `0`.

[source, sql]
--------------------------------------------------
Expand Down Expand Up @@ -441,8 +446,8 @@ STARTS_WITH(

*Output*: boolean value

*Description*: Returns `true` if the source expression starts with the specified pattern, `false` otherwise. The matching is case sensitive.
If either parameters is `null`, the function returns `null`.
*Description*: Returns `true` if the source expression starts with the specified
pattern, `false` otherwise. The matching is case sensitive.

[source, sql]
--------------------------------------------------
Expand Down