Why is the WITH statement causing an error in Trino SQL, stating: "SQL Error [57]: ...: Schema must be specified when session schema is not set"?

"Why is the WITH statement causing an error in Trino SQL, stating: 'SQL Error [57]: ...: Schema must be specified when session schema is not set'? What specific query or context led to this error? Are there any particular details about the schema or session settings that might be relevant? Additionally, could you provide the exact SQL query that triggered this error, as well as any error logs or messages that offer more insights?"

The error message "SQL Error [57]: Schema must be specified when session schema is not set" in Trino SQL typically occurs when the session schema is not explicitly set, and the query references a schema without specifying it. This can happen when using the WITH statement if the schema is not properly defined.

Possible Causes and Solutions Session Schema Not Set:

Ensure that the session schema is set before running the query. You can set the session schema using the USE statement.

WITH Statement Context:

Verify that the WITH statement is correctly referencing the schema. If the schema is not specified in the WITH clause, it might cause this error.

Error Logs:

Check the error logs for more detailed information about the error. This can help pinpoint the exact issue and provide more insights into why the schema is not being recognized.

Best Practices Explicit Schema References: Always explicitly reference the schema in your queries to avoid ambiguity.

Session Configuration: Set the session schema at the beginning of your session to ensure consistency.

Error Handling: Implement error handling to catch and address schema-related errors gracefully.