Infromatica cloud- The Snowflake Connector failed to read data from the source because of the following error: null

I am using custom SQL in SQL override section in Advance property of snowflake source in IICS Informatica cloud. select (max(LAST_UPDATED_DATE)) from $$DB.test.org. $$DB parameter is defined in the parameter file $$DB=Dev. Parameter is resolving correctly at run time but getting below error.

READER_1_2_1> SNOWFLAKECLOUDDATAWAREHOUSE_10000 [2020-10-30 03:07:00.440] [INFO] The Snowflake Connector uses the following SQL query to read data: select (max(LAST_UPDATED_DATE)) from Dev.test.org
READER_1_2_1> CMN_1761 [2020-10-30 03:07:00.440] Timestamp Event: [Fri Oct 30 03:07:00 2020]
READER_1_2_1> SNOWFLAKECLOUDDATAWAREHOUSE_10000 [2020-10-30 03:07:00.441] [ERROR] The Snowflake Connector failed to read data from the source because of the following error: [SnowFlake_READER__FAILED_906] The Snowflake Connector failed to read data from the source because of the following error: null
READER_1_2_1> CMN_1761 [2020-10-30 03:07:00.441] Timestamp Event: [Fri Oct 30 03:07:00 2020]
READER_1_2_1> SNOWFLAKECLOUDDATAWAREHOUSE_10000 [2020-10-30 03:07:00.441] [ERROR] Error occured while reading data using CCI Data Adapter  com.informatica.cci.runtime.internal.utils.impl.CExceptionImpl: Unable to get result data: Adapter read method has returned failure.
READER_1_2_1> CMN_1761 [2020-10-30 03:07:00.441] Timestamp Event: [Fri Oct 30 03:07:00 2020]
READER_1_2_1> CONNECTOR_10000 [2020-10-30 03:07:00.441] [ERROR] Error Occured while reading data from the source for Transformation - SRC_Organization | Connector Name - SnowflakeCloudDataWarehouse - Unable to get result data: Adapter read method has returned failure.

Thanks in Advance.

The issue was with the column list. Custom query should be like select (max(LAST_UPDATED_DATE)) as LAST_UPDATED_DATE from $$DB.test.org and the Field list should have only one column LAST_UPDATED_DATE. Mapping is working fine now.