Array macros (#454)

* Temporary dev-requirements

* Changelog entry

* Implementations and tests for array macros

* Remove `cast_array_to_string` macro

* Restore original dev-requirements.txt

Author: dbeatty10

.changes/unreleased/Features-20220913-084852.yaml

@@ -0,0 +1,7 @@
+kind: Features
+body: Array macros
+time: 2022-09-13T08:48:52.684985-06:00
+custom:
+  Author: graciegoheen dbeatty10
+  Issue: "453"
+  PR: "454"

dbt/include/spark/macros/utils/array_append.sql

@@ -0,0 +1,3 @@
+{% macro spark__array_append(array, new_element) -%}
+    {{ array_concat(array, array_construct([new_element])) }}
+{%- endmacro %}

dbt/include/spark/macros/utils/array_concat.sql

@@ -0,0 +1,3 @@
+{% macro spark__array_concat(array_1, array_2) -%}
+    concat({{ array_1 }}, {{ array_2 }})
+{%- endmacro %}

dbt/include/spark/macros/utils/array_construct.sql

@@ -0,0 +1,3 @@
+{% macro spark__array_construct(inputs, data_type) -%}
+    array( {{ inputs|join(' , ') }} )
+{%- endmacro %}

tests/functional/adapter/utils/test_utils.py

@@ -1,5 +1,8 @@
 import pytest
 
+from dbt.tests.adapter.utils.test_array_append import BaseArrayAppend
+from dbt.tests.adapter.utils.test_array_concat import BaseArrayConcat
+from dbt.tests.adapter.utils.test_array_construct import BaseArrayConstruct
 from dbt.tests.adapter.utils.test_any_value import BaseAnyValue
 from dbt.tests.adapter.utils.test_bool_or import BaseBoolOr
 from dbt.tests.adapter.utils.test_cast_bool_to_text import BaseCastBoolToText
@@ -31,6 +34,18 @@ class TestAnyValue(BaseAnyValue):
     pass
 
 
+class TestArrayAppend(BaseArrayAppend):
+    pass
+
+
+class TestArrayConcat(BaseArrayConcat):
+    pass
+
+
+class TestArrayConstruct(BaseArrayConstruct):
+    pass
+
+
 class TestBoolOr(BaseBoolOr):
     pass