[GitHub] [spark] cloud-fan commented on a change in pull request #34848: [SPARK-37582][SPARK-37583][SQL] CONTAINS, STARTSWITH, ENDSWITH should support all data type

[GitBox <gi...@apache.org>]

cloud-fan commented on a change in pull request #34848:
URL: https://github.com/apache/spark/pull/34848#discussion_r814577105



##########
File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
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@@ -468,13 +469,65 @@ abstract class StringPredicate extends BinaryExpression
   override def toString: String = s"$nodeName($left, $right)"
 }
 
-/**
- * A function that returns true if the string `left` contains the string `right`.
- */
+trait StringBinaryPredicateExpressionBuilderBase extends ExpressionBuilder {
+  override def build(funcName: String, expressions: Seq[Expression]): Expression = {
+    val numArgs = expressions.length
+    if (numArgs == 2) {
+      if (expressions(0).dataType == BinaryType && expressions(1).dataType == BinaryType) {
+        BinaryStringPredicate(funcName, expressions(0), expressions(1))
+      } else {
+        createStringPredicate(expressions(0), expressions(1))
+      }
+    } else {
+      throw QueryCompilationErrors.invalidFunctionArgumentNumberError(Seq(2), funcName, numArgs)
+    }
+  }
+
+  protected def funcName: String

Review comment:
       do we need this?




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