From effcac6496bbc9f9b2d7ee32acb05b9fb96d5802 Mon Sep 17 00:00:00 2001
From: Alex Vasilev <vaspiring@gmail.com>
Date: Sun, 5 Dec 2021 18:08:45 +0300
Subject: [PATCH] feat: support parsing MySQL show variables (#6)

---
 src/ast/mod.rs           | 11 +++++++++++
 src/keywords.rs          |  1 +
 src/parser.rs            |  4 ++++
 tests/sqlparser_mysql.rs |  7 +++++++
 4 files changed, 23 insertions(+)

diff --git a/src/ast/mod.rs b/src/ast/mod.rs
index 312a86813..01724c80b 100644
--- a/src/ast/mod.rs
+++ b/src/ast/mod.rs
@@ -996,6 +996,10 @@ pub enum Statement {
     ///
     /// Note: this is a PostgreSQL-specific statement.
     ShowVariable { variable: Vec<Ident> },
+    /// SHOW VARIABLES
+    ///
+    /// Note: this is a MySQL-specific statement.
+    ShowVariables { filter: Option<ShowStatementFilter> },
     /// SHOW CREATE TABLE
     ///
     /// Note: this is a MySQL-specific statement.
@@ -1787,6 +1791,13 @@ impl fmt::Display for Statement {
                 }
                 Ok(())
             }
+            Statement::ShowVariables { filter } => {
+                write!(f, "SHOW VARIABLES")?;
+                if filter.is_some() {
+                    write!(f, " {}", filter.as_ref().unwrap().to_string())?;
+                }
+                Ok(())
+            }
             Statement::ShowCreate { obj_type, obj_name } => {
                 write!(
                     f,
diff --git a/src/keywords.rs b/src/keywords.rs
index 7643298e4..af8bf2f5e 100644
--- a/src/keywords.rs
+++ b/src/keywords.rs
@@ -543,6 +543,7 @@ define_keywords!(
     VALUE_OF,
     VARBINARY,
     VARCHAR,
+    VARIABLES,
     VARYING,
     VAR_POP,
     VAR_SAMP,
diff --git a/src/parser.rs b/src/parser.rs
index 76190feb9..0363e1376 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -3694,6 +3694,10 @@ impl<'a> Parser<'a> {
             Ok(self.parse_show_columns()?)
         } else if self.parse_one_of_keywords(&[Keyword::CREATE]).is_some() {
             Ok(self.parse_show_create()?)
+        } else if self.parse_keyword(Keyword::VARIABLES) && dialect_of!(self is MySqlDialect | GenericDialect) {
+            Ok(Statement::ShowVariables {
+                filter: self.parse_show_statement_filter()?,
+            })
         } else {
             Ok(Statement::ShowVariable {
                 variable: self.parse_identifiers()?,
diff --git a/tests/sqlparser_mysql.rs b/tests/sqlparser_mysql.rs
index b3c02de30..004b2c876 100644
--- a/tests/sqlparser_mysql.rs
+++ b/tests/sqlparser_mysql.rs
@@ -820,6 +820,13 @@ fn parse_substring_in_select() {
     }
 }
 
+#[test]
+fn parse_show_variables() {
+    mysql_and_generic().verified_stmt("SHOW VARIABLES");
+    mysql_and_generic().verified_stmt("SHOW VARIABLES LIKE 'admin%'");
+    mysql_and_generic().verified_stmt("SHOW VARIABLES WHERE value = '3306'");
+}
+
 #[test]
 fn parse_kill() {
     let stmt = mysql_and_generic().verified_stmt("KILL CONNECTION 5");