athlcode commented on code in PR #21720:
URL: https://github.com/apache/datafusion/pull/21720#discussion_r3203268047
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datafusion/common/src/config.rs:
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@@ -692,6 +692,17 @@ config_namespace! {
/// `false` — ANSI SQL mode is disabled by default.
pub enable_ansi_mode: bool, default = false
+ /// Policy for handling duplicate keys in Spark-compatible
map-construction
+ /// functions (`map_from_arrays`, `map_from_entries`, `str_to_map`).
+ ///
+ /// Mirrors Spark's
+ ///
[`spark.sql.mapKeyDedupPolicy`](https://github.com/apache/spark/blob/cf3a34e19dfcf70e2d679217ff1ba21302212472/sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala#L4961):
+ /// - `"EXCEPTION"` (default): raise `[DUPLICATED_MAP_KEY]` at runtime
on any duplicate key.
+ /// - `"LAST_WIN"`: keep the last occurrence of each duplicate key.
+ ///
+ /// Values are case-insensitive. Only affects functions under
`datafusion/spark`.
+ pub map_key_dedup_policy: String, default = "EXCEPTION".to_string()
Review Comment:
thank you, added MapKeyDedupPolicy enum with Exception (default) + LastWin
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