extract support_period_map_access_key config

Author: goldmedal

src/dialect/bigquery.rs

@@ -72,4 +72,8 @@ impl Dialect for BigQueryDialect {
     fn require_interval_qualifier(&self) -> bool {
         true
     }
+
+    fn support_period_map_access_key(&self) -> bool {
+        true
+    }
 }

src/dialect/duckdb.rs

@@ -71,4 +71,9 @@ impl Dialect for DuckDbDialect {
     fn supports_load_extension(&self) -> bool {
         true
     }
+
+    /// See DuckDB <https://duckdb.org/docs/sql/data_types/struct.html#retrieving-from-structs>
+    fn support_period_map_access_key(&self) -> bool {
+        true
+    }
 }

src/dialect/generic.rs

@@ -119,4 +119,8 @@ impl Dialect for GenericDialect {
     fn supports_load_extension(&self) -> bool {
         true
     }
+
+    fn support_period_map_access_key(&self) -> bool {
+        true
+    }
 }

src/dialect/mod.rs

@@ -657,6 +657,15 @@ pub trait Dialect: Debug + Any {
     fn supports_create_table_select(&self) -> bool {
         false
     }
+
+    /// Return true if the dialect supports the period map access key
+    ///
+    /// Access on BigQuery nested and repeated expressions can
+    /// mix notations in the same expression.
+    /// https://cloud.google.com/bigquery/docs/nested-repeated#query_nested_and_repeated_columns
+    fn support_period_map_access_key(&self) -> bool {
+        false
+    }
 }
 
 /// This represents the operators for which precedence must be defined