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Execution example::
table_create NestedDrilldownTags TABLE_PAT_KEY ShortText
# [[0,1337566253.89858,0.000355720520019531],true]
column_create NestedDrilldownTags category COLUMN_SCALAR ShortText
# [[0,1337566253.89858,0.000355720520019531],true]
table_create NestedDrilldownMemos TABLE_HASH_KEY ShortText
# [[0,1337566253.89858,0.000355720520019531],true]
column_create NestedDrilldownMemos tag COLUMN_SCALAR NestedDrilldownTags
# [[0,1337566253.89858,0.000355720520019531],true]
load --table NestedDrilldownMemos
[
{"_key": "Groonga is fast!", "tag": "Groonga"},
{"_key": "Groonga sticker!", "tag": "Groonga"},
{"_key": "Mroonga sticker!", "tag": "Mroonga"},
{"_key": "Rroonga is fast!", "tag": "Rroonga"}
]
# [[0,1337566253.89858,0.000355720520019531],4]
load --table NestedDrilldownTags
[
{"_key": "Groonga", "category": "C/C++"},
{"_key": "Mroonga", "category": "C/C++"},
{"_key": "PGroonga", "category": "C/C++"},
{"_key": "Rroonga", "category": "Ruby"}
]
# [[0,1337566253.89858,0.000355720520019531],4]
select NestedDrilldownMemos \
--drilldowns[Tag].keys tag \
--drilldowns[Tag].output_columns _key \
--drilldowns[Category].table Tag \
--drilldowns[Category].keys category \
--drilldowns[Category].output_columns _key,_nsubrecs
# [
# [
# 0,
# 1337566253.89858,
# 0.000355720520019531
# ],
# [
# [
# [
# 4
# ],
# [
# [
# "_id",
# "UInt32"
# ],
# [
# "_key",
# "ShortText"
# ],
# [
# "tag",
# "NestedDrilldownTags"
# ]
# ],
# [
# 1,
# "Groonga is fast!",
# "Groonga"
# ],
# [
# 2,
# "Groonga sticker!",
# "Groonga"
# ],
# [
# 3,
# "Mroonga sticker!",
# "Mroonga"
# ],
# [
# 4,
# "Rroonga is fast!",
# "Rroonga"
# ]
# ],
# {
# "Tag": [
# [
# 3
# ],
# [
# [
# "_key",
# "ShortText"
# ]
# ],
# [
# "Groonga"
# ],
# [
# "Mroonga"
# ],
# [
# "Rroonga"
# ]
# ],
# "Category": [
# [
# 2
# ],
# [
# [
# "_key",
# "ShortText"
# ],
# [
# "_nsubrecs",
# "Int32"
# ]
# ],
# [
# "C/C++",
# 2
# ],
# [
# "Ruby",
# 1
# ]
# ]
# }
# ]
# ]
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