THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Lateral view is used in conjunction with user-defined table generating functions such as explode(). As mentioned in LanguageManual UDF#UDTF Built-in Table-Generating Functions, a UDTF generates one or more output rows for each input row. A lateral view first applies the UDTF to each row of base table and then joins resulting output rows to the input rows to form a virtual table having the supplied table alias.
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string pageid | Array<int> adid_list | ||
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="2bfe333ed5dd52a9-10e2b03d-48ed4b90-97c2b668-70c9a909804b97bfad409bf4"><ac:plain-text-body><![CDATA[ | "front_page" | [1, 2, 3] | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="d7fe13d2d6b6d25d-274592ed-4a184b8c-aabc914f-c594558869103a8f45da2ffd"><ac:plain-text-body><![CDATA[ | "contact_page" | [3, 4, 5] | ]]></ac:plain-text-body></ac:structured-macro> |
and the user would like to count the total number of times an ad appears across all pages.
A lateral view with explode() LanguageManual UDF#explode can be used to convert adid_list into separate rows using the query:
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Array<int> col1 | Array<string> col2 | ||
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="69c6d881fc343be9-2a4c27ca-4ca649be-b404932b-a483525f589ff6f294ba7edc"><ac:plain-text-body><![CDATA[ | [1, 2] | [a", "b", "c"] | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="7eb7b4dca1dd4276-edcfa0ef-47d14406-97ef9103-eec720437325ae37ef3a04d1"><ac:plain-text-body><![CDATA[ | [3, 4] | [d", "e", "f"] | ]]></ac:plain-text-body></ac:structured-macro> |
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int mycol1 | Array<string> col2 | ||
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="401308b8e8f85cb5-52b97440-40644df1-abf2a31d-d32086e40b3382537b71f184"><ac:plain-text-body><![CDATA[ | 1 | [a", "b", "c"] | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="2c0d0cd2767932be-8962db06-440c41e6-a352af60-bb5c09cd05e5166dc0b0da93"><ac:plain-text-body><![CDATA[ | 2 | [a", "b", "c"] | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="16693f71faaa7eeb-8bd87788-42494a5c-a5c2972f-ec605cd4dcc180a86a2bb32f"><ac:plain-text-body><![CDATA[ | 3 | [d", "e", "f"] | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="ffcb008e433d5b95-12cc09ee-470b44d5-8332a6fe-a5844cc1627690b3a035c873"><ac:plain-text-body><![CDATA[ | 4 | [d", "e", "f"] | ]]></ac:plain-text-body></ac:structured-macro> |
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