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fix basic function concat in table model (#630)
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‎src/UserGuide/Master/Table/SQL-Manual/Basis-Function.md‎

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@@ -772,21 +772,21 @@ The `||` operator is used for string concatenation and functions the same as the
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### 8.2 String Functions
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| Function Name | Description | Input | Output | Usage |
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| :------------ | :----------------------------------------------------------- | :----------------------------------------------------------- | :------ | :----------------------------------------------------------- |
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| `length` | Returns the number of characters in a string (not byte length). | `string` (the string whose length is to be calculated) | INT32 | length(string) |
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| `upper` | Converts all letters in a string to uppercase. | string | String | upper(string) |
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| `lower` | Converts all letters in a string to lowercase. | string | String | lower(string) |
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| `trim` | Removes specified leading and/or trailing characters from a string. **Parameters:** - `specification` (optional): Specifies which side to trim: - `BOTH`: Removes characters from both sides (default). - `LEADING`: Removes characters from the beginning. - `TRAILING`: Removes characters from the end. - `trimcharacter` (optional): Character to be removed (default is whitespace). - `string`: The target string. | string | String | trim([ [ specification ] [ trimcharacter ] FROM ] string) Example：`trim('!' FROM '!foo!');` —— `'foo'` |
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| `strpos` | Returns the position of the first occurrence of `subStr` in `sourceStr`. **Notes:** - Position starts at `1`. - Returns `0` if `subStr` is not found. - Positioning is based on characters, not byte arrays. | `sourceStr` (string to be searched), `subStr` (substring to find) | INT32 | strpos(sourceStr, subStr) |
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| `starts_with` | Checks if `sourceStr` starts with the specified `prefix`. | `sourceStr`, `prefix` | Boolean | starts_with(sourceStr, prefix) |
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| `ends_with` | Checks if `sourceStr` ends with the specified `suffix`. | `sourceStr`, `suffix` | Boolean | ends_with(sourceStr, suffix) |
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| `concat` | Concatenates `string1, string2, ..., stringN`. Equivalent to the `||` operator. | `string`, `text` | String | concat(str1, str2, ...) or str1 \|\| str2 ... |
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| `strcmp` | Compares two strings lexicographically. **Returns:** - `-1` if `str1 < str2` - `0` if `str1 = str2` - `1` if `str1 > str2` - `NULL` if either `str1` or `str2` is `NULL` | `string1`, `string2` | INT32 | strcmp(str1, str2) |
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| `replace` | Removes all occurrences of `search` in `string`. | `string`, `search` | String | replace(string, search) |
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| `replace` | Replaces all occurrences of `search` in `string` with `replace`. | `string`, `search`, `replace` | String | replace(string, search, replace) |
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| `substring` | Extracts a substring from `start_index` to the end of the string. **Notes:** - `start_index` starts at `1`. - Returns `NULL` if input is `NULL`. - Throws an error if `start_index` is greater than string length. | `string`, `start_index` | String | substring(string from start_index)or substring(string, start_index) |
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| `substring` | Extracts a substring of `length` characters starting from `start_index`. **Notes:** - `start_index` starts at `1`. - Returns `NULL` if input is `NULL`. - Throws an error if `start_index` is greater than string length. - Throws an error if `length` is negative. - If `start_index + length` exceeds `int.MAX`, an overflow error may occur. | `string`, `start_index`, `length` | String | substring(string from start_index for length) or substring(string, start_index, length) |
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| Function Name | Description | Input | Output | Usage |
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| :------------ |:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:------------------------------------------------------------------| :------ | :----------------------------------------------------------- |
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| `length` | Returns the number of characters in a string (not byte length). | `string` (the string whose length is to be calculated) | INT32 | length(string) |
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| `upper` | Converts all letters in a string to uppercase. | string | String | upper(string) |
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| `lower` | Converts all letters in a string to lowercase. | string | String | lower(string) |
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| `trim` | Removes specified leading and/or trailing characters from a string. **Parameters:** - `specification` (optional): Specifies which side to trim: - `BOTH`: Removes characters from both sides (default). - `LEADING`: Removes characters from the beginning. - `TRAILING`: Removes characters from the end. - `trimcharacter` (optional): Character to be removed (default is whitespace). - `string`: The target string. | string | String | trim([ [ specification ] [ trimcharacter ] FROM ] string) Example：`trim('!' FROM '!foo!');` —— `'foo'` |
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| `strpos` | Returns the position of the first occurrence of `subStr` in `sourceStr`. **Notes:** - Position starts at `1`. - Returns `0` if `subStr` is not found. - Positioning is based on characters, not byte arrays. | `sourceStr` (string to be searched), `subStr` (substring to find) | INT32 | strpos(sourceStr, subStr) |
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| `starts_with` | Checks if `sourceStr` starts with the specified `prefix`. | `sourceStr`, `prefix` | Boolean | starts_with(sourceStr, prefix) |
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| `ends_with` | Checks if `sourceStr` ends with the specified `suffix`. | `sourceStr`, `suffix` | Boolean | ends_with(sourceStr, suffix) |
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| `concat` | Concatenates `string1, string2, ..., stringN`. Equivalent to the `\|\|` operator. | `string`, `text` | String | concat(str1, str2, ...) or str1 \|\| str2 ... |
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| `strcmp` | Compares two strings lexicographically. **Returns:** - `-1` if `str1 < str2` - `0` if `str1 = str2` - `1` if `str1 > str2` - `NULL` if either `str1` or `str2` is `NULL` | `string1`, `string2` | INT32 | strcmp(str1, str2) |
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| `replace` | Removes all occurrences of `search` in `string`. | `string`, `search` | String | replace(string, search) |
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| `replace` | Replaces all occurrences of `search` in `string` with `replace`. | `string`, `search`, `replace` | String | replace(string, search, replace) |
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| `substring` | Extracts a substring from `start_index` to the end of the string. **Notes:** - `start_index` starts at `1`. - Returns `NULL` if input is `NULL`. - Throws an error if `start_index` is greater than string length. | `string`, `start_index` | String | substring(string from start_index)or substring(string, start_index) |
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| `substring` | Extracts a substring of `length` characters starting from `start_index`. **Notes:** - `start_index` starts at `1`. - Returns `NULL` if input is `NULL`. - Throws an error if `start_index` is greater than string length. - Throws an error if `length` is negative. - If `start_index + length` exceeds `int.MAX`, an overflow error may occur. | `string`, `start_index`, `length` | String | substring(string from start_index for length) or substring(string, start_index, length) |
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## 9. Pattern Matching Functions
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