Re: [PR] [CALCITE-6771] Convert Type from FLOAT to DOUBLE in PrestoDialect [calcite]

Thu, 09 Jan 2025 00:39:22 -0800 


xiaochen-zhou commented on code in PR #4132:
URL: https://github.com/apache/calcite/pull/4132#discussion_r1908355396


##########
core/src/main/java/org/apache/calcite/sql/dialect/PrestoSqlDialect.java:
##########
@@ -146,7 +148,14 @@ private static void unparseUsingLimit(SqlWriter writer, 
@Nullable SqlNode offset
   }
 
   @Override public @Nullable SqlNode getCastSpec(RelDataType type) {
-    return super.getCastSpec(type);
+    switch (type.getSqlTypeName()) {
+    // PRESTO only supports REAL、DOUBLE for floating point types.
+    case FLOAT:
+      return new SqlDataTypeSpec(
+          new SqlBasicTypeNameSpec(SqlTypeName.DOUBLE, SqlParserPos.ZERO), 
SqlParserPos.ZERO);

Review Comment:
   Calcite FLOAT and DOUBLE are the same type, 
   
![image](https://github.com/user-attachments/assets/d1660596-27f8-436b-ae9e-31be787d3215)



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