public static PostgreSQLDataType fromString(String typeString) {
        if (typeString == null) {
            return UNKNOWN;
        }

        PostgreSQLDataType starRocksDataType = dataTypeMap.get(typeString);
        if (starRocksDataType == null) {
            starRocksDataType = dataTypeMap.getOrDefault(typeString.toUpperCase(), PostgreSQLDataType.UNKNOWN);
        }

        return starRocksDataType;
    }
convert string type to PostgreSQLDataType instance

@param typeString
@return
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/postgres-cdc/src/main/java/org/apache/inlong/sort/cdc/postgres/table/PostgreSQLDataType.java