Lateral view clause is used in conjunction with user-defined table generating functions(UDTF) such as explode().A UDTF generates zero or more output rows for each input row. A lateral view first applies the UDTF to each row of base and then joins results output rows to the input rows to form a virtual table … See more The column alias can be omitted. In this case, aliases are inherited from fields name of StructObjectInspector which is returned from UDTF. See more Assuming you have one table: And the table contains two rows: Now, you can use LATERAL VIEW to convert the column addid_listinto separate rows: Also, if you have one table: You … See more WebThe LATERAL VIEW clauses can reference the aliases of the tables and columns that are listed before the FROM clause. This aims to split row data in different columns. Sample data For example, the pageAds table contains three columns. The first column is pageid string. The second column is col1 array. The third column is col2 array.
SQL concat_ws, collect_set, 和explode合并使用 - 易学编程网
WebNov 30, 2015 · select explode(ProductColorOptions ) from products; Red. Green. But I want to join with other columns like id but that leads to an error. In that case, we need to use Lateral View.Lateral view creates a virtual table for exploded columns and make join with the base table. We need not to worry about the virtual table as it is done by hive ... WebApr 12, 2024 · 行转列. 常用的算子:. explode(),posexplode(),lateral view. 简单行转列. 含义:将一个融合多个信息的字段拆分成一列(多行),简单理解为一行数据变多行数据。. 举例:. 结果展示:aaa,bbb,ccc ===> aaa bbb ccc 步骤:先用split切开按照,进行分隔成数组的形式 ["aaa","bbb","ccc"] 然后再用explode函数炸开,将一行 ... csis travel
Spark INLINE Vs. LATERAL VIEW EXPLODE differences?
Webexplode can only be placed in the SELECT list as the root of an expression or following a LATERAL VIEW . When placing the function in the SELECT list there must be no other generator function in the same SELECT list or UNSUPPORTED_GENERATOR.MULTI_GENERATOR is raised. Applies to: Databricks … WebOct 1, 2024 · Oracle中的connect by 转成hive的 lateral view explode 发表评论 首先我们先来看一下业务sql select t.dept,t.day,count(*) from( select regexp_substr(dept), " [^,]+", 1, level) dept,day from ( select wm_concat(dept) dept,day from baseinfo group by day ) m connect by level <= regexp_count(dept,",") + 1 ) t group by t.dept,t.day Code language: … WebAug 13, 2024 · LATERAL VIEW explode (Phone) myTable2 as Phone When you just explode a column like EXPLODE (Subject) then it will provide you the list of all the elements present in the column, like C,JAVA,SQL,etc. Practice a few questions What is CROSS JOIN UNNEST? What is LATERAL VIEW EXPLODE in SQL? The Data Monk Interview … csi strange sound