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SQL Server 2022 Polybase on Delta File Format
We are testing Polybase with external tables on Delta format in ADLS Gen 2 on SQL Server 2022(16.0.4055.4). (https://learn.microsoft.com/en-us/sql/relational-databases/polybase/virtualize-delta?view=...
Check if trace flag 6408 is set, or if pushdown is enabled; none of them should be used for your scenario.