fix: Update parser for indexed field

Author: alamb

datafusion/core/src/sql/planner.rs

@@ -97,9 +97,10 @@ fn plan_key(key: SQLExpr) -> Result<ScalarValue> {
             ScalarValue::Int64(Some(s.parse().unwrap()))
         }
         SQLExpr::Value(Value::SingleQuotedString(s)) => ScalarValue::Utf8(Some(s)),
+        SQLExpr::Identifier(Ident { value, .. }) => ScalarValue::Utf8(Some(value)),
         _ => {
             return Err(DataFusionError::SQL(ParserError(format!(
-                "Unsuported index key expression: {}",
+                "Unsuported index key expression: {:?}",
                 key
             ))))
         }
@@ -1645,6 +1646,11 @@ impl<'a, S: ContextProvider> SqlToRel<'a, S> {
                 }
             }
 
+            SQLExpr::ArrayIndex { obj, indexs } => {
+                let expr = self.sql_expr_to_logical_expr(*obj, schema, ctes)?;
+                plan_indexed(expr, indexs)
+            }
+
             SQLExpr::CompoundIdentifier(ids) => {
                 let mut var_names: Vec<_> = ids.into_iter().map(|s| normalize_ident(&s)).collect();