goldmedal commented on code in PR #11547:
URL: https://github.com/apache/datafusion/pull/11547#discussion_r1688090369
##########
datafusion/substrait/src/logical_plan/consumer.rs:
##########
@@ -1785,6 +1798,98 @@ fn from_substrait_literal(
}
}
}
+ Some(LiteralType::Map(m)) => {
+ // Each entry should start the name index from the same value,
then we increase it
+ // once at the end
+ let mut entry_name_idx = *name_idx;
+ let entries = m
+ .key_values
+ .iter()
+ .map(|kv| {
+ entry_name_idx = *name_idx;
+ let key_sv = from_substrait_literal(
+ kv.key.as_ref().unwrap(),
+ extensions,
+ dfs_names,
+ &mut entry_name_idx,
+ )?;
+ let value_sv = from_substrait_literal(
+ kv.value.as_ref().unwrap(),
+ extensions,
+ dfs_names,
+ &mut entry_name_idx,
+ )?;
+ ScalarStructBuilder::new()
Review Comment:
> this was the most high-level way of creating the map I could think of, lmk
if you have better ideas!
It looks good to me. If you intend to be more efficient, I suggest referring
to how `make_map_batch_internal` creates a `MapArray`.
https://github.com/apache/datafusion/blob/77311a5896272c7ed252d8cd53d48ec6ea7c0ccf/datafusion/functions-array/src/map.rs#L80
You need to partition the key and value pairs into two arrays, and build the
`MapArray` based on them. Maybe you can refer to `plan_make_map`.
https://github.com/apache/datafusion/blob/77311a5896272c7ed252d8cd53d48ec6ea7c0ccf/datafusion/functions-array/src/planner.rs#L104
However, I think it just some improvements. We don't need to do that in this
PR.
##########
datafusion/common/src/hash_utils.rs:
##########
@@ -692,6 +732,64 @@ mod tests {
assert_eq!(hashes[0], hashes[1]);
}
+ #[test]
+ // Tests actual values of hashes, which are different if forcing collisions
+ #[cfg(not(feature = "force_hash_collisions"))]
+ fn create_hashes_for_map_arrays() {
+ let mut builder =
+ MapBuilder::new(None, StringBuilder::new(), Int32Builder::new());
+ // Row 0
+ builder.keys().append_value("key1");
+ builder.keys().append_value("key2");
+ builder.values().append_value(10);
+ builder.values().append_value(11);
+ builder.append(true).unwrap();
+ // Row 1
+ builder.keys().append_value("key1");
+ builder.keys().append_value("key2");
+ builder.values().append_value(10);
+ builder.values().append_value(11);
+ builder.append(true).unwrap();
+ // Row 2
+ builder.keys().append_value("key1");
+ builder.keys().append_value("key2");
+ builder.values().append_value(10);
+ builder.values().append_value(12);
+ builder.append(true).unwrap();
+ // Row 3
+ builder.keys().append_value("key1");
+ builder.keys().append_value("key3");
+ builder.values().append_value(10);
+ builder.values().append_value(11);
+ builder.append(true).unwrap();
+ // Row 4
+ builder.keys().append_value("key1");
+ builder.values().append_value(10);
+ builder.append(true).unwrap();
+ // Row 5
+ builder.keys().append_value("key1");
+ builder.values().append_null();
+ builder.append(true).unwrap();
+ // Row 6
+ builder.append(true).unwrap();
+ // Row 7
+ builder.keys().append_value("key1");
+ builder.values().append_value(10);
+ builder.append(false).unwrap();
+
+ let array = Arc::new(builder.finish()) as ArrayRef;
+
+ let random_state = RandomState::with_seeds(0, 0, 0, 0);
+ let mut hashes = vec![0; array.len()];
+ create_hashes(&[array], &random_state, &mut hashes).unwrap();
+ assert_eq!(hashes[0], hashes[1]); // same value
+ assert_ne!(hashes[0], hashes[2]); // different key
+ assert_ne!(hashes[0], hashes[3]); // different value
Review Comment:
```suggestion
assert_ne!(hashes[0], hashes[2]); // different value
assert_ne!(hashes[0], hashes[3]); // different key
```
I guess the comments are wrong.
The difference between `Row 0` and `Row 2` is the value of `key2`: `{'key2':
11}` in Row 0 and `{'key2': 12}` in Row 2.
However, the difference between `Row 0` and `Row 3` is the key: `key2` in
Row 0 and `key3` in Row 3.
Did I say that correctly?
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