tustvold commented on code in PR #4607:
URL: https://github.com/apache/arrow-datafusion/pull/4607#discussion_r1061412161
##########
datafusion/core/src/execution/context.rs:
##########
@@ -1641,6 +1619,97 @@ impl SessionState {
self
}
+ /// Creates a [`LogicalPlan`] from the provided SQL string
+ ///
+ /// See [`SessionContext::sql`] for a higher-level interface that also
handles DDL
+ pub async fn create_logical_plan(&self, sql: &str) -> Result<LogicalPlan> {
+ use crate::catalog::information_schema::INFORMATION_SCHEMA_TABLES;
+ use datafusion_sql::parser::Statement as DFStatement;
+ use sqlparser::ast::*;
+ use std::collections::hash_map::Entry;
+
+ let mut statements = DFParser::parse_sql(sql)?;
+ if statements.len() != 1 {
+ return Err(DataFusionError::NotImplemented(
+ "The context currently only supports a single SQL
statement".to_string(),
+ ));
+ }
+ let statement = statements.pop_front().unwrap();
+
+ let mut relations = hashbrown::HashSet::with_capacity(10);
+
+ match &statement {
+ DFStatement::Statement(s) => {
+ struct RelationVisitor<'a>(&'a mut
hashbrown::HashSet<ObjectName>);
+
+ impl<'a> Visitor for RelationVisitor<'a> {
+ type Break = ();
+
+ fn pre_visit_relation(
+ &mut self,
+ relation: &ObjectName,
+ ) -> ControlFlow<()> {
+ self.0.get_or_insert_with(relation, |_|
relation.clone());
+ ControlFlow::Continue(())
+ }
+
+ fn pre_visit_statement(
Review Comment:
This is a bit gross, but I hope to split apart the query planning from the
other types of query, that will clean this up.
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