BigQuery使用Python的標準SQL無法使用OFFSET關鍵字

Question

我想使用Python API的BigQuery標準SQL，但我無法執行在WEB UI中成功運行的查詢。

基本上，我分裂一個字符串，然後使用OFFSET關鍵字來獲取特定索引的值。具體如下：

CASE WHEN t.depth = 1 THEN '' WHEN t.depth = 2 THEN '' WHEN t.depth = 3 THEN '' WHEN t.depth = 4 THEN '' WHEN t.depth = 5 THEN '' WHEN t.depth = 6 THEN t.curr WHEN t.depth = 7 THEN SPLIT(t.ancestry,'/')[OFFSET(6)] ELSE '' END AS level7, 


CASE WHEN t.depth = 1 THEN '' WHEN t.depth = 2 THEN '' WHEN t.depth = 3 THEN '' WHEN t.depth = 4 THEN '' WHEN t.depth = 5 THEN t.curr WHEN t.depth = 6 THEN SPLIT(t.ancestry,'/')[OFFSET(5)] WHEN t.depth = 7 THEN SPLIT(t.ancestry,'/')[OFFSET(5)] ELSE '' END AS level6, 

上面的代碼運行，而無需在WEB UI的問題，而使用Python API和設置useLegacySQL = False，我收到以下錯誤

raise HttpError(resp, content, uri=self.uri) 
googleapiclient.errors.HttpError: <HttpError 400 when requesting https://www.googleapis.com/bigquery/v2/projects/************* 
returned "Encountered " "]" "[OFFSET(6)] "" at line 7, column 217. Was expecting: "END" ..."> 

任何幫助表示讚賞。

Answer 1

它看起來像使用遺留SQL基於錯誤消息執行查詢。我看到了同樣的消息，當我嘗試執行此使用傳統的SQL，例如：

SELECT 
    CASE s 
    WHEN 'first' THEN SPLIT(arr, ',')[OFFSET(0)] 
    WHEN 'second' THEN SPLIT(arr, ',')[OFFSET(1)] 
    ELSE NULL 
    END AS val 
FROM (SELECT '1,2' AS arr, 'second' AS s); 

Error: Encountered " "]" "[OFFSET(0)] "" at line 1, column 48. Was expecting: "END" ... 

編輯：從Enabling Standard SQL鏈接的例子是不正確。該選項不是useLegacySQL，而是選項useLegacySql（q和l小寫）。跟蹤問題在https://code.google.com/p/google-bigquery/issues/detail?id=701。