[GitHub] [calcite] neoremind commented on a change in pull request #1990: [CALCITE-4026] When the cassandra primary key is of type bigint,the query will report an error

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neoremind commented on a change in pull request #1990:
URL: https://github.com/apache/calcite/pull/1990#discussion_r433155542



##########
File path: cassandra/src/main/java/org/apache/calcite/adapter/cassandra/CassandraFilter.java
##########
@@ -174,14 +174,13 @@ private String translateMatch(RexNode condition) {
       }
     }
 
-    /** Convert the value of a literal to a string.
+    /** Returns the value of the literal.
      *
      * @param literal Literal to translate
-     * @return String representation of the literal
+     * @return The value of the literal in the form of the actual type.
      */
-    private static String literalValue(RexLiteral literal) {
-      Object value = literal.getValue2();
-      return String.valueOf(value);
+    private static Object literalValue(RexLiteral literal) {
+      return literal.getValue2();
     }

Review comment:
       For problem 2. Even if C* adapter supports precision, in avatica, `DateTimeUtils` handles milliseconds timestamp as below and neglects the precision, so that the string returned losses precision.
   ```
    /** Helper for CAST({timestamp} AS VARCHAR(n)). */
     public static String unixTimestampToString(long timestamp) {
       return unixTimestampToString(timestamp, 0);
     }
   ```




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