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Showing content from https://github.com/apache/datafusion/issues/14436 below:

Attach `Diagnostic` to "duplicate table name" error · Issue #14436 · apache/datafusion · GitHub

For a query like:

SELECT * FROM users a, users a

The only message that the end user of an application built atop of DataFusion sees is:

Schema error: Schema contains duplicate qualified field name a.id

Similarly, for:

WITH cte AS (SELECT 1 AS col), cte AS (SELECT 2 AS col) SELECT 1

We get:

Error during planning: WITH query name "cte" specified more than once

We want to provide a richer message that references and highlights locations in the original SQL query, and contextualises and helps the user understand the error. In the end, it would be possible to display errors in a fashion akin to what was enabled by #13664 for some errors:

See #14429 for more information.

Attach a well crafted Diagnostic to the DataFusionError, building on top of the foundations laid in #13664. See #14429 for more information.

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