feat: label computed result columns with their source expression - #41
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Result columns for computed projections were all labelled
expr, soSELECT city, COUNT(id), AVG(age) ... GROUP BY cityprintedcity | expr | expr.Adds
ast.String, which renders an expression back to SQL-like text (columns, literals, unary/binary operators with parenthesized nesting,IS [NOT] NULL, and aggregate calls includingCOUNT(*)), and uses it to label projections. A bare column reference still keeps its plain unqualified name, matching SQLite, so join queries printnamerather thanusers.name.Headers now read
city | COUNT(id) | AVG(age).Closes #40