Enable custom dialects to support MATCH() AGAINST() (apache#1719)

Author: joocer

src/dialect/generic.rs

@@ -147,4 +147,8 @@ impl Dialect for GenericDialect {
     fn supports_array_typedef_size(&self) -> bool {
         true
     }
+
+    fn supports_match_against(&self) -> bool {
+        true
+    }
 }

src/dialect/mod.rs

@@ -479,6 +479,11 @@ pub trait Dialect: Debug + Any {
         false
     }
 
+    /// Does the dialect support the `MATCH() AGAINST()` syntax?
+    fn supports_match_against(&self) -> bool {
+        false
+    }
+
     /// Dialect-specific infix parser override
     ///
     /// This method is called to parse the next infix expression.

src/dialect/mysql.rs

@@ -129,6 +129,10 @@ impl Dialect for MySqlDialect {
     fn requires_single_line_comment_whitespace(&self) -> bool {
         true
     }
+
+    fn supports_match_against(&self) -> bool {
+        true
+    }
 }
 
 /// `LOCK TABLES`

src/parser/mod.rs

@@ -1198,7 +1198,7 @@ impl<'a> Parser<'a> {
                     })))
                 }
             Keyword::NOT => Ok(Some(self.parse_not()?)),
-            Keyword::MATCH if dialect_of!(self is MySqlDialect | GenericDialect) => {
+            Keyword::MATCH if self.dialect.supports_match_against() => {
                 Ok(Some(self.parse_match_against()?))
             }
             Keyword::STRUCT if self.dialect.supports_struct_literal() => {