DOC-4200: add TCEs to the aggregation query page (#3381)

doctests/query_agg.py

@@ -0,0 +1,103 @@
+# EXAMPLE: query_agg
+# HIDE_START
+import json
+import redis
+from redis.commands.json.path import Path
+from redis.commands.search import Search
+from redis.commands.search.aggregation import AggregateRequest
+from redis.commands.search.field import NumericField, TagField
+from redis.commands.search.indexDefinition import IndexDefinition, IndexType
+import redis.commands.search.reducers as reducers
+
+r = redis.Redis(decode_responses=True)
+
+# create index
+schema = (
+    TagField("$.condition", as_name="condition"),
+    NumericField("$.price", as_name="price"),
+)
+
+index = r.ft("idx:bicycle")
+index.create_index(
+    schema,
+    definition=IndexDefinition(prefix=["bicycle:"], index_type=IndexType.JSON),
+)
+
+# load data
+with open("data/query_em.json") as f:
+    bicycles = json.load(f)
+
+pipeline = r.pipeline(transaction=False)
+for bid, bicycle in enumerate(bicycles):
+    pipeline.json().set(f'bicycle:{bid}', Path.root_path(), bicycle)
+pipeline.execute()
+# HIDE_END
+
+# STEP_START agg1
+search = Search(r, index_name="idx:bicycle")
+aggregate_request = AggregateRequest(query='@condition:{new}') \
+    .load('__key', 'price') \
+    .apply(discounted='@price - (@price * 0.1)')
+res = search.aggregate(aggregate_request)
+print(len(res.rows)) # >>> 5
+print(res.rows) # >>> [['__key', 'bicycle:0', ...
+#[['__key', 'bicycle:0', 'price', '270', 'discounted', '243'],
+# ['__key', 'bicycle:5', 'price', '810', 'discounted', '729'],
+# ['__key', 'bicycle:6', 'price', '2300', 'discounted', '2070'],
+# ['__key', 'bicycle:7', 'price', '430', 'discounted', '387'],
+# ['__key', 'bicycle:8', 'price', '1200', 'discounted', '1080']]
+# REMOVE_START
+assert len(res.rows) == 5
+# REMOVE_END
+# STEP_END
+
+# STEP_START agg2
+search = Search(r, index_name="idx:bicycle")
+aggregate_request = AggregateRequest(query='*') \
+    .load('price') \
+    .apply(price_category='@price<1000') \
+    .group_by('@condition', reducers.sum('@price_category').alias('num_affordable'))
+res = search.aggregate(aggregate_request)
+print(len(res.rows)) # >>> 3
+print(res.rows) # >>>
+#[['condition', 'refurbished', 'num_affordable', '1'],
+# ['condition', 'used', 'num_affordable', '1'],
+# ['condition', 'new', 'num_affordable', '3']]
+# REMOVE_START
+assert len(res.rows) == 3
+# REMOVE_END
+# STEP_END
+
+# STEP_START agg3
+search = Search(r, index_name="idx:bicycle")
+aggregate_request = AggregateRequest(query='*') \
+    .apply(type="'bicycle'") \
+    .group_by('@type', reducers.count().alias('num_total'))
+res = search.aggregate(aggregate_request)
+print(len(res.rows)) # >>> 1
+print(res.rows) # >>> [['type', 'bicycle', 'num_total', '10']]
+# REMOVE_START
+assert len(res.rows) == 1
+# REMOVE_END
+# STEP_END
+
+# STEP_START agg4
+search = Search(r, index_name="idx:bicycle")
+aggregate_request = AggregateRequest(query='*') \
+    .load('__key') \
+    .group_by('@condition', reducers.tolist('__key').alias('bicycles'))
+res = search.aggregate(aggregate_request)
+print(len(res.rows)) # >>> 3
+print(res.rows) # >>>
+#[['condition', 'refurbished', 'bicycles', ['bicycle:9']],
+# ['condition', 'used', 'bicycles', ['bicycle:1', 'bicycle:2', 'bicycle:3', 'bicycle:4']],
+# ['condition', 'new', 'bicycles', ['bicycle:5', 'bicycle:6', 'bicycle:7', 'bicycle:0', 'bicycle:8']]]
+# REMOVE_START
+assert len(res.rows) == 3
+# REMOVE_END
+# STEP_END
+
+# REMOVE_START
+# destroy index and data
+r.ft("idx:bicycle").dropindex(delete_documents=True)
+# REMOVE_END