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* refactor: projection expression handling Prep for #4749. This commit changes the way the engine resolves '*' in a projection, e.g. `SELECT * FROM X;`. Previously, the `Analyzer` was responsible for expanding the `*` into the set of columns of each source. However, this code was getting complicated and would be much more complicated once the key column can have any name, (#3536). The complexity comes about because the `Analyzer` would need to determine the presence of joins, group bys, partition bys, etc, which can effect how `*` is resolved. This logic duplicates the logic in the `LogicalPlanner` and `PlanNode` sub-classes. With this commit sees the logical plan and planner being responsible for resolving any `*` in the projection. This is achieved by asking the parent of the projection node to resolve the `*` into the set of columns. Parent node types that do not know how to resolve the `*`, e.g. `FilterNode`, forward requests to their parents. In this way, the resolution request ripples up the logical plan until it reaches a `DataSourceNode`, which can resolve the `*` into a list of columns. `JoinNode` knows how forward `*`, `left.*` and `right.*` appropriately. Previously, the list of `SelectExpressions` was passed down from parent `PlanNode` to child, allowing some nodes to rewrite the expressions. For example, `FlatMapNode` would rewrite any expression involving a TableFunction to use the internal names like `KSQL_SYNTH_0`. With this commit this is no longer necessary. Instead, when building a projection node the planner asks it's parent node to resolve any selects, allowing the parent to perform any rewrite. At the moment, the planner is still responsible for much of this work. In the future, this logic may move into the plan itself. However, such a change would increase the complexity of this commit. Co-authored-by: Andy Coates <[email protected]>
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ksqldb-engine/src/main/java/io/confluent/ksql/analyzer/AggregateAnalysis.java
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