[GitHub] [arrow-datafusion] andygrove commented on a diff in pull request #2642: Implement DESCRIBE

andygrove commented on code in PR #2642:
URL: https://github.com/apache/arrow-datafusion/pull/2642#discussion_r884315197


##########
datafusion/sql/src/planner.rs:
##########
@@ -353,6 +354,24 @@ impl<'a, S: ContextProvider> SqlToRel<'a, S> {
         }
     }
 
+    pub fn decrible_table_to_plan(
+        &self,
+        statement: DescribeTable,
+    ) -> Result<LogicalPlan> {
+        if self.has_table("information_schema", "tables") {
+            let table_name = statement.table_name;
+            let sql = format!("SELECT column_name, data_type, is_nullable \
+                                FROM information_schema.columns WHERE table_name = '{table_name}';");
+            let mut rewrite = DFParser::parse_sql(&sql[..])?;
+            self.statement_to_plan(rewrite.pop_front().unwrap())
+        } else {
+            Err(DataFusionError::Plan(
+                "SHOW TABLES is not supported unless information_schema is enabled"

Review Comment:
   ```suggestion
                   "DESCRIBE TABLE is not supported unless information_schema is enabled"
   ```



##########
datafusion/sql/src/planner.rs:
##########
@@ -353,6 +354,24 @@ impl<'a, S: ContextProvider> SqlToRel<'a, S> {
         }
     }
 
+    pub fn decrible_table_to_plan(

Review Comment:
   ```suggestion
       pub fn decribe_table_to_plan(
   ```



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