EmbulkでMySQLからBigQueryに入れ子になったJSONファイルを直接インポートする方法 - Qiita
{"id": 1, "nickname": "joker1007", "comments": [{"id": 1, "body": "comment body"}, {"id": 2, "body": "next comment"}] SELECT CONCAT( '{', '"id":',users.id, ',"nickname":',IF(users.nickname, CONCAT('"', users.nickname, '"'), "null"), ',"comments":',CONCAT('[', GROUP_CONCAT((CONCAT('{"id":', comments.id), CONCAT(',"body":"',comments.body,'"}')), ']'), '}' ) AS payload FROM users INNER JOIN comments
Ruby Memory Model
Ruby Memory Model Indented italic paragraphs are used for notes. This document is work-in-progress. Intentions of this effort and document are: to summarize the behavior of Ruby in concurrent and parallel environments, initiate the discussion, identify problems in the document, find flaws in Ruby implementations if any, suggest what has to be enhanced in Ruby itself and cooperate on adding the enh
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