Test square brackets with index/key expressions

See gh-27925

spring-jdbc/src/test/java/org/springframework/jdbc/core/namedparam/NamedParameterUtilsTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -319,4 +319,29 @@ public class NamedParameterUtilsTests {
 		assertThat(psql2.getParameterNames().get(0)).isEqualTo("xxx");
 	}
 
+	@Test  // gh-27925
+	void namedParamMapReference() {
+		String sql = "insert into foos (id) values (:headers[id])";
+		ParsedSql psql = NamedParameterUtils.parseSqlStatement(sql);
+		assertThat(psql.getNamedParameterCount()).isEqualTo(1);
+		assertThat(psql.getParameterNames()).containsExactly("headers[id]");
+
+		class Foo {
+			final Map<String, Object> headers = new HashMap<>();
+			public Foo() {
+				this.headers.put("id", 1);
+			}
+			public Map<String, Object> getHeaders() {
+				return this.headers;
+			}
+		}
+
+		Foo foo = new Foo();
+		Object[] params = NamedParameterUtils.buildValueArray(psql,
+				new BeanPropertySqlParameterSource(foo), null);
+
+		assertThat(params[0]).isInstanceOf(SqlParameterValue.class);
+		assertThat(((SqlParameterValue) params[0]).getValue()).isEqualTo(foo.getHeaders().get("id"));
+	}
+
 }