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eliminate_distinct_on_for_dialect

polyglot_sql::transforms

Function eliminate_distinct_on_for_dialect 

Source 
pub fn eliminate_distinct_on_for_dialect(
    expr: Expression,
    target: Option<DialectType>,
) -> Result<Expression>
Expand description

Eliminate DISTINCT ON with dialect-specific NULL ordering behavior.

For dialects where NULLs don’t sort first by default in DESC ordering, we need to add explicit NULL ordering to preserve DISTINCT ON semantics.