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Handle duplicate column names #46

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@bcho

Bad case:

haha
| extend p = 1 + 2, lines = 3 + 2
| extend q = p + lines
| take 100
q1 as (with q0 as (select 1 + 2 as p, 3 + 2 as lines, * from ku_cli_mcpxw3gjzWAA7F5KnFa3F_haha) select p + lines as q, * from q0) select * from q1 limit 100

This will yield:

q,p,lines,ts,lines:1

Where lines:1 is generated by sqlite, to distinct duplicated column names (ref). We should remove this column from the output. However, we need the "original column" information from the C API to filter this out.

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