pub fn propagate_struct_field_names(expr: Expression) -> Result<Expression>Expand description
Convert BigQuery-style UNNEST aliases to column-alias format for DuckDB/Presto/Spark.
BigQuery uses: UNNEST(arr) AS x where x is a column alias.
DuckDB/Presto/Spark need: UNNEST(arr) AS _t0(x) where _t0 is a table alias and x is the column alias.
Propagate struct field names from the first named struct in an array to subsequent unnamed structs.
In BigQuery, [STRUCT('Alice' AS name, 85 AS score), STRUCT('Bob', 92)] means the second struct
should inherit field names from the first: [STRUCT('Alice' AS name, 85 AS score), STRUCT('Bob' AS name, 92 AS score)].