j-esse commented on issue #23556: [SPARK-26626][SQL] Maximum size for repeatedly substituted aliases in SQL expressions URL: https://github.com/apache/spark/pull/23556#issuecomment-454859062 Ah sorry I think I didn't explain the problem clearly enough - the OOMs happen inside CollapseProject while performing the optimisation (and inside PhysicalOperation). The recursive alias substitution grows the expression tree so large that it OOMs. We're not using UDFs or any expensive expressions. To repro, try this in Spark Shell: ``` var df = Seq(1, 2, 3).toDF("a").withColumn("b", lit(10)).cache() for( i <- 1 to 20 ) { df = df.select(('a + 'b).as('a), ('a - 'b).as('b)) } df.collect() ```
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