Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/6405#discussion_r31372110
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionTypeCheckingSuite.scala
---
@@ -0,0 +1,131 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.catalyst.expressions
+
+import org.apache.spark.sql.AnalysisException
+import org.apache.spark.sql.catalyst.analysis.SimpleAnalyzer
+import org.apache.spark.sql.catalyst.plans.logical.LocalRelation
+import org.apache.spark.sql.catalyst.dsl.plans._
+import org.apache.spark.sql.catalyst.dsl.expressions._
+import org.apache.spark.sql.types.{BooleanType, StringType}
+import org.scalatest.FunSuite
+
+
+class ExpressionTypeCheckingSuite extends FunSuite {
+
+ val testRelation = LocalRelation(
+ 'intField.int,
+ 'stringField.string,
+ 'booleanField.boolean,
+ 'complexField.array(StringType))
+
+ def assertError(expr: Expression, errorMessage: String): Unit = {
+ val e = intercept[AnalysisException] {
+ assertSuccess(expr)
+ }
+ assert(e.getMessage.contains(
+ s"cannot resolve '${expr.prettyString}' due to data type mismatch:"))
+ assert(e.getMessage.contains(errorMessage))
+ }
+
+ def assertSuccess(expr: Expression): Unit = {
+ val analyzed = testRelation.select(expr.as("c")).analyze
+ SimpleAnalyzer.checkAnalysis(analyzed)
+ }
+
+ def assertErrorForDifferingTypes(expr: Expression): Unit = {
+ assertError(expr,
+ s"differing types in ${expr.getClass.getSimpleName} (IntegerType and
BooleanType).")
+ }
+
+ test("check types for unary arithmetic") {
+ assertError(UnaryMinus('stringField), "operator - accepts numeric
type")
+ assertSuccess(Sqrt('stringField)) // We will cast String to Double for
sqrt
+ assertError(Sqrt('booleanField), "function sqrt accepts numeric type")
+ assertError(Abs('stringField), "function abs accepts numeric type")
+ assertError(BitwiseNot('stringField), "operator ~ accepts integral
type")
+ }
+
+ test("check types for binary arithmetic") {
+ // We will cast String to Double for binary arithmetic
+ assertSuccess(Add('intField, 'stringField))
+ assertSuccess(Subtract('intField, 'stringField))
+ assertSuccess(Multiply('intField, 'stringField))
+ assertSuccess(Divide('intField, 'stringField))
+ assertSuccess(Remainder('intField, 'stringField))
+ // checkAnalysis(BitwiseAnd('intField, 'stringField))
--- End diff --
Seems you want a rule in `PromoteStrings` to handle `Bitwise`?
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