Function mz_sql::plan::query::plan_rows_from_internal

fn plan_rows_from_internal<'a>(
    qcx: &QueryContext<'_>,
    functions: impl IntoIterator<Item = &'a Function<Aug>>,
    table_name: Option<FullItemName>
) -> Result<(HirRelationExpr, Scope, Vec<usize>), PlanError>

Plans an expression coalescing multiple table functions. Each table function is followed by its row ordinality. The entire expression is followed by the coalesced row ordinality.

The returned Scope will set all item’s table_name’s to the table_name parameter if it is Some. If None, they will be the name of each table function.

The returned Vec<usize> is the number of (non-ordinality) columns from each table function.

For example, with table functions tf1 returning 1 column (a) and tf2 returning 2 columns (b, c), this function will return an expr 6 columns:

• tf1.a
• tf1.ordinality
• tf2.b
• tf2.c
• tf2.ordinality
• coalesced_ordinality

And a Vec<usize> of [1, 2].