Document Postgres Array syntax

Author: nene

sql/arrays-and-maps.md

@@ -9,6 +9,11 @@ Array literals `[1, "two", 3]`. Supported by:
 - [BigQuery][bigquery-literals].
 - [N1QL][n1ql-literals].
 
+Array literals `ARRAY[1, 2, 3]`. Supported by:
+
+- [BigQuery][bigquery-literals].
+- [PostgreSQL][postgres-literals].
+
 Map literals in JSON style `{"foo": 1, "bar": "John"}`. Supported by:
 
 - [N1QL][n1ql-literals].
@@ -22,9 +27,12 @@ Supported by:
 - [Hive][]
 - [Spark][]
 - [N1QL][]
+- [PostgreSQL][]
 
 [hive]: https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-OperatorsonComplexTypes
 [spark]: https://stackoverflow.com/questions/34916038/sparksql-sql-syntax-for-nth-item-in-array
 [n1ql-literals]: https://docs.couchbase.com/server/current/n1ql/n1ql-language-reference/datatypes.html#arrays
 [n1ql]: https://docs.couchbase.com/server/current/n1ql/n1ql-language-reference/nestedops.html#field-selection
+[postgresql]: https://www.postgresql.org/docs/current/arrays.html#ARRAYS-ACCESSING
 [bigquery-literals]: https://cloud.google.com/bigquery/docs/reference/standard-sql/lexical#array_literals
+[postgres-literals]: https://www.postgresql.org/docs/current/arrays.html