{"id":4354,"date":"2022-08-22T11:10:09","date_gmt":"2022-08-22T05:40:09","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-spark-scala-execute-dataframe-within-for-loop\/"},"modified":"2022-08-22T11:10:09","modified_gmt":"2022-08-22T05:40:09","slug":"solved-spark-scala-execute-dataframe-within-for-loop","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-spark-scala-execute-dataframe-within-for-loop\/","title":{"rendered":"[Solved] Spark (Scala) execute dataframe within for loop"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-42908643\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"42908643\" data-parentid=\"42900556\" data-score=\"3\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>Your code is almost correct.<br \/>\nExcept two things :<\/p>\n<ul>\n<li><code>i<\/code> is already used in your <code>for<\/code> loop so don&#8217;t use it in <code>val i =<\/code> <\/li>\n<li>If you want to use the value of <code>i<\/code> in a string, use String Interpolation<\/li>\n<\/ul>\n<p>So your code should look like :<\/p>\n<pre><code>for (i &lt;- List ('a','b')) {\n  val df = sqlContext.sql(s\"SELECT $i, col1, col2 FROM DF1\")\n  df.show()\n}\n<\/code><\/pre>\n<hr>\n<p><strong>EDIT after author comment :<\/strong><\/p>\n<p>You can do this with a <code>.map<\/code> and then a <code>.reduceLeft<\/code> :<\/p>\n<pre><code>\/\/ All your dataframes\nval dfs = Seq('a','b').map { i =&gt;\n  sqlContext.sql(s\"SELECT $i, col1, col2 FROM DF1\")\n}\n\n\/\/ Then you can reduce your dataframes into one\nval unionDF = dfs.reduceLeft((dfa, dfb) =&gt; \n  dfa.unionAll(dfb)\n)\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">2<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Spark (Scala) execute dataframe within for loop <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Your code is almost correct. Except two things : i is already used in your for loop so don&#8217;t use it in val i = If you want to use the value of i in a string, use String Interpolation So your code should look like : for (i &lt;- List (&#8216;a&#8217;,&#8217;b&#8217;)) { val &#8230; <a title=\"[Solved] Spark (Scala) execute dataframe within for loop\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-spark-scala-execute-dataframe-within-for-loop\/\" aria-label=\"More on [Solved] Spark (Scala) execute dataframe within for loop\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[803,804,802,805],"class_list":["post-4354","post","type-post","status-publish","format-standard","hentry","category-solved","tag-apache-spark","tag-apache-spark-sql","tag-scala","tag-spark-dataframe"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Spark (Scala) execute dataframe within for loop - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-spark-scala-execute-dataframe-within-for-loop\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Spark (Scala) execute dataframe within for loop - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Your code is almost correct. Except two things : i is already used in your for loop so don&#8217;t use it in val i = If you want to use the value of i in a string, use String Interpolation So your code should look like : for (i &lt;- List (&#039;a&#039;,&#039;b&#039;)) { val ... 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Except two things : i is already used in your for loop so don&#8217;t use it in val i = If you want to use the value of i in a string, use String Interpolation So your code should look like : for (i &lt;- List ('a','b')) { val ... 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