Add getDataLength for numeric without precision

Author: shin1103

embulk-output-postgresql/src/main/java/org/embulk/output/postgresql/PostgreSQLOutputConnection.java

@@ -16,6 +16,7 @@
 public class PostgreSQLOutputConnection
         extends JdbcOutputConnection
 {
+    private static final int MIN_NUMERIC_PRECISION = 1;
     private static final int MAX_NUMERIC_PRECISION = 1000;
 
     public PostgreSQLOutputConnection(Connection connection, String schemaName, String roleName)
@@ -263,9 +264,9 @@ protected String buildColumnTypeName(JdbcColumn c)
             }
             break;
         case "NUMERIC": // only "NUMERIC" because PostgreSQL JDBC driver will return also "NUMERIC" for the type name of decimal.
-            if (c.getDataLength() > MAX_NUMERIC_PRECISION) {
-                // getDataLength for numeric without precision will return 131089 .
-                // but cannot create column of numeric(131089) .
+            if (c.getDataLength() > MAX_NUMERIC_PRECISION || c.getDataLength() < MIN_NUMERIC_PRECISION) {
+                // getDataLength for numeric without precision will return 0 or 131089 .
+                // but cannot create column of numeric(0) and numeric(131089) .
                 return "NUMERIC";
             }
             break;