From ff82113b837fd89e16f0853f9448ce3f67164a0e Mon Sep 17 00:00:00 2001
From: Chris Allen <chrisa@indeed.com>
Date: Tue, 5 Jul 2022 14:57:44 -0500
Subject: [PATCH] Support for empty array literals

---
 src/parser.rs               | 14 +++++++++++---
 tests/sqlparser_postgres.rs | 10 ++++++++++
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/src/parser.rs b/src/parser.rs
index 325d90c47..0a872ce87 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -883,9 +883,17 @@ impl<'a> Parser<'a> {
     /// Parses an array expression `[ex1, ex2, ..]`
     /// if `named` is `true`, came from an expression like  `ARRAY[ex1, ex2]`
     pub fn parse_array_expr(&mut self, named: bool) -> Result<Expr, ParserError> {
-        let exprs = self.parse_comma_separated(Parser::parse_expr)?;
-        self.expect_token(&Token::RBracket)?;
-        Ok(Expr::Array(Array { elem: exprs, named }))
+        if self.peek_token() == Token::RBracket {
+            let _ = self.next_token();
+            Ok(Expr::Array(Array {
+                elem: vec![],
+                named,
+            }))
+        } else {
+            let exprs = self.parse_comma_separated(Parser::parse_expr)?;
+            self.expect_token(&Token::RBracket)?;
+            Ok(Expr::Array(Array { elem: exprs, named }))
+        }
     }
 
     /// Parse a SQL LISTAGG expression, e.g. `LISTAGG(...) WITHIN GROUP (ORDER BY ...)`.
diff --git a/tests/sqlparser_postgres.rs b/tests/sqlparser_postgres.rs
index 8bb2dd56a..0d5b3f1d3 100644
--- a/tests/sqlparser_postgres.rs
+++ b/tests/sqlparser_postgres.rs
@@ -1228,6 +1228,16 @@ fn parse_array_index_expr() {
         },
         expr_from_projection(only(&select.projection)),
     );
+
+    let sql = "SELECT ARRAY[]";
+    let select = pg_and_generic().verified_only_select(sql);
+    assert_eq!(
+        &Expr::Array(sqlparser::ast::Array {
+            elem: vec![],
+            named: true
+        }),
+        expr_from_projection(only(&select.projection)),
+    );
 }
 
 #[test]