Alexey Temnikov

[BUG] "Unsupported conversion for Relational Data type: BINARY" error when accessing non-existent nested fields in struct types (Usability Issue)

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## What is the bug? When querying a non-existent nested field within a struct/object type, users receive a cryptic error message: ``` "Unsupported conversion for Relational Data type: BINARY" ```...

## Query Information **PPL Command/Query:** ```ppl source=test-nested-agg | stats COUNT() by request.path source=test-nested-agg | top request.path ``` **Expected Result:** Aggregation operations should return grouped counts by the nested field values,...

## Query Information **PPL Command/Query:** ```ppl # This works - returns 3 results with computed NameLen field source=test-nested-eval-filter | eval NameLen=LENGTH(items.name) | fields id, items.name, NameLen # This fails -...