amaliujia commented on code in PR #38193:
URL: https://github.com/apache/spark/pull/38193#discussion_r991673158
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connector/connect/src/main/protobuf/spark/connect/relations.proto:
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@@ -31,7 +31,7 @@ option java_package = "org.apache.spark.connect.proto";
message Relation {
RelationCommon common = 1;
oneof rel_type {
- Read read = 2;
+ UnresolvedRelation unresolved_relation = 2;
Review Comment:
Per the review suggestions on https://github.com/apache/spark/pull/38086, we
plan to decouple unresolved relation and data source (e.g. in different
messages). cc @cloud-fan
Data source needs its own plan with its own fields. In that case current
`Read` will only be unresolved relation.
For Spark I don't think Relation and DataSource are ever being the same
concept. Relation has an identifier and analyzer needs to resolve it. Data
source has format, path, schema and other configurations. IIRC relation and
data source do not share same fields.
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