Copilot commented on code in PR #4893:
URL: https://github.com/apache/calcite/pull/4893#discussion_r3106316727


##########
file/src/main/java/org/apache/calcite/adapter/file/CsvStreamReader.java:
##########
@@ -54,8 +54,12 @@ class CsvStreamReader extends CSVReader implements Closeable 
{
   public static final long DEFAULT_MONITOR_DELAY = 2000;
 
   CsvStreamReader(Source source) {
+    this(source, CSVParser.DEFAULT_SEPARATOR);
+  }
+
+  CsvStreamReader(Source source, char separator) {
     this(source,
-        CSVParser.DEFAULT_SEPARATOR,
+        separator,
         CSVParser.DEFAULT_QUOTE_CHARACTER,
         CSVParser.DEFAULT_ESCAPE_CHARACTER,

Review Comment:
   Now that CsvStreamReader exposes a constructor that accepts a custom 
separator, the class Javadoc for readNext() (later in this file) still 
describes the result as “comma-separated”. That wording is misleading for 
non-comma separators; update it to be delimiter/separator-agnostic.



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