[#1317] fix(trino-connector): Support Fixed type conversion (#1318)

### What changes were proposed in this pull request?

1. Suppoort type 'Fixed' in Trino connector `GeneralDataTypeTransformer`
 
### Why are the changes needed?

Fixed type is needed by Iceberg type.

Fix: #1317 

### Does this PR introduce _any_ user-facing change?

N/A

### How was this patch tested?

IT.

integration-test/src/test/java/com/datastrato/gravitino/integration/test/trino/TrinoConnectorIT.java

@@ -505,7 +505,7 @@ private ColumnDTO[] createIcebergFullTypeColumns() {
     ColumnDTO[] columnDTO = createFullTypeColumns();
 
     Set<String> unsupportedType =
-        Sets.newHashSet("ByteType", "ShortType", "VarCharType", "FixedCharType", "FixedType");
+        Sets.newHashSet("ByteType", "ShortType", "VarCharType", "FixedCharType");
     return Arrays.stream(columnDTO)
         .filter(c -> !unsupportedType.contains(c.name()))
         .toArray(ColumnDTO[]::new);

trino-connector/src/main/java/com/datastrato/gravitino/trino/connector/catalog/hive/HiveDataTypeTransformer.java

@@ -12,7 +12,7 @@
 
 /** Type transformer between Hive and Trino */
 public class HiveDataTypeTransformer extends GeneralDataTypeTransformer {
-  // Hive varchar max length of 65535
+  // Max length of Hive varchar is 65535
   private static final int HIVE_VARCHAR_MAX_LENGTH = 65535;
 
   @Override

trino-connector/src/main/java/com/datastrato/gravitino/trino/connector/catalog/iceberg/IcebergDataTypeTransformer.java

@@ -9,6 +9,7 @@
 import com.datastrato.gravitino.rel.types.Type.Name;
 import com.datastrato.gravitino.rel.types.Types;
 import com.datastrato.gravitino.trino.connector.util.GeneralDataTypeTransformer;
+import io.trino.spi.type.VarbinaryType;
 
 /** Type transformer between Iceberg and Trino */
 public class IcebergDataTypeTransformer extends GeneralDataTypeTransformer {
@@ -21,4 +22,12 @@ public Type getGravitinoType(io.trino.spi.type.Type type) {
     }
     return gravitinoType;
   }
+
+  @Override
+  public io.trino.spi.type.Type getTrinoType(Type type) {
+    if (Name.FIXED == type.name()) {
+      return VarbinaryType.VARBINARY;
+    }
+    return super.getTrinoType(type);
+  }
 }