Enable numeric-prefix identifiers for Databricks dialect

Databricks, built on Spark SQL, allows identifiers that start with
digits. The Spark SQL ANTLR lexer defines IDENTIFIER as
(UNICODE_LETTER | DIGIT | '_')+, with no restriction on the first
character.

Enable the existing supports_numeric_prefix() for DatabricksDialect.

Author: funcpp

src/dialect/databricks.rs

@@ -39,6 +39,10 @@ impl Dialect for DatabricksDialect {
         matches!(ch, 'a'..='z' | 'A'..='Z' | '0'..='9' | '_')
     }
 
+    fn supports_numeric_prefix(&self) -> bool {
+        true
+    }
+
     fn supports_filter_during_aggregation(&self) -> bool {
         true
     }

tests/sqlparser_databricks.rs

@@ -644,3 +644,10 @@ fn parse_databricks_json_accessor() {
         "SELECT raw:store.bicycle.price::DOUBLE FROM store_data",
     );
 }
+
+#[test]
+fn parse_numeric_prefix_identifier() {
+    databricks().verified_stmt("SELECT * FROM catalog.schema.1st_table");
+
+    databricks().verified_stmt("SELECT * FROM a.b.1c");
+}