Snowflake Connector doesn't support VARIANT type with CONVERT_TO_VARCHAR option

[ChrisSandison]

Error message

com.google.common.util.concurrent.UncheckedExecutionException: com.google.common.util.concurrent.UncheckedExecutionException: com.google.common.base.VerifyException: Unsupported type handling is set to CONVERT_TO_VARCHAR, but toColumnMapping() returned empty for JdbcTypeHandle{jdbcType=12, jdbcTypeName=VARIANT, columnSize=0, decimalDigits=0}

The snowflake data type is VARIANT. It looks like the case may just need to be handled here

trino/plugin/trino-snowflake/src/main/java/io/trino/plugin/snowflake/SnowflakeClient.java

Line 154 in 82fcef8

public Optional<ColumnMapping> toColumnMapping(ConnectorSession session, Connection connection, JdbcTypeHandle typeHandle)

[ChrisSandison]

Also seeing a similar error with OBJECT types

[ebyhr]

Closing as duplicate of #20977