NobiGo commented on code in PR #4384:
URL: https://github.com/apache/calcite/pull/4384#discussion_r2096735210


##########
testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java:
##########
@@ -12487,6 +12487,29 @@ private static void 
checkStringAggFuncFails(SqlOperatorFixture f) {
         false);
   }
 
+  /** Test case for
+   * <a 
href="https://issues.apache.org/jira/browse/CALCITE-6951";>[CALCITE-6951]
+   * Add STRING_TO_ARRAY function(enabled in PostgreSQL Library)</a>.

Review Comment:
   Should be `</a>. */`,No need for a line break. Please note to add space 
after `</a>.`.



##########
site/_docs/reference.md:
##########
@@ -2945,6 +2945,7 @@ In the following:
 | s | MAP_FROM_ENTRIES(arrayOfRows)                  | Returns a map created 
from an arrays of row with two fields. Note that the number of fields in a row 
must be 2. Note that calcite is using the LAST_WIN strategy
 | s | 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*. Note 
that calcite is using the LAST_WIN strategy
 | s | SUBSTRING_INDEX(string, delim, count)          | Returns the substring 
from *string* before *count* occurrences of the delimiter *delim*. If *count* 
is positive, everything to the left of the final delimiter (counting from the 
left) is returned. If *count* is negative, everything to the right of the final 
delimiter (counting from the right) is returned. The function substring_index 
performs a case-sensitive match when searching for *delim*.
+| p r | STRING_TO_ARRAY(string, delimiter [, nullText ]) | Returns a 
one-dimensional text[] array by splitting the input text value into subvalues 
using the specified text value as the "delimiter". Optionally, allows a 
specified text value to be interpreted as NULL.

Review Comment:
   Replace text with String? There is no "text" data type in Calcite.



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