liuyongvs opened a new pull request, #3238:
URL: https://github.com/apache/calcite/pull/3238
STR_TO_MAP(string[, stringDelimiter[, keyValueDelimiter]])
Returns a map after splitting the string into key/value pairs using
delimiters. Default delimiters are ',' for stringDelimiter and ':' for
keyValueDelimiter Both pairDelim and keyValueDelim are treated as regular
expressions.
```
Examples:
> SELECT str_to_map('a:1,b:2,c:3', ',', ':');
- {"a":"1","b":"2","c":"3"}
> SELECT str_to_map('a');
{"a":null}
```
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