Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14472#discussion_r74197135
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/SQLQueryTestSuite.scala ---
@@ -0,0 +1,211 @@
+/*
+ * 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
+
+import java.io.File
+import java.util.{Locale, TimeZone}
+
+import org.apache.spark.sql.catalyst.rules.RuleExecutor
+import org.apache.spark.sql.catalyst.util.{fileToString, stringToFile}
+import org.apache.spark.sql.test.SharedSQLContext
+
+/**
+ * End-to-end test cases for SQL queries.
+ *
+ * Each case is loaded from a file in
"spark/sql/core/src/test/resources/sql-tests/inputs".
+ * Each case has a golden result file in
"spark/sql/core/src/test/resources/sql-tests/results".
+ *
+ * To re-generate golden files, run:
+ * {{{
+ * SPARK_GENERATE_GOLDEN_FILES=1 build/sbt "sql/test-only
*SQLQueryTestSuite"
+ * }}}
+ *
+ * The format for input files is simple:
+ * 1. A list of SQL queries separated by semicolon.
+ * 2. Lines starting with -- are treated as comments and ignored.
+ *
+ * For example:
+ * {{{
+ * -- this is a comment
+ * select 1, -1;
+ * select current_date;
+ * }}}
+ *
+ * The format for golden result files look roughly like:
+ * {{{
+ * -- some header information
+ *
+ * -- !query 0
+ * select 1, -1
+ * -- !query 0 schema
+ * struct<...schema...>
+ * -- !query 0 output
+ * ... data row 1 ...
+ * ... data row 2 ...
+ * ...
+ *
+ * -- !query 1
+ * ...
+ * }}}
+ */
+class SQLQueryTestSuite extends QueryTest with SharedSQLContext {
+
+ private val regenerateGoldenFiles: Boolean =
System.getenv("SPARK_GENERATE_GOLDEN_FILES") == "1"
+
+ private val baseResourcePath = {
+ // If regenerateGoldenFiles is true, we must be running this in SBT
and we use hard-coded
+ // relative path. Otherwise, we use classloader's getResource to find
the location.
+ if (regenerateGoldenFiles) {
+ java.nio.file.Paths.get("src", "test", "resources",
"sql-tests").toFile
+ } else {
+ val res = getClass.getClassLoader.getResource("sql-tests")
+ new File(res.getFile)
+ }
+ }
+
+ private val inputFilePath = new File(baseResourcePath,
"inputs").getAbsolutePath
+ private val goldenFilePath = new File(baseResourcePath,
"results").getAbsolutePath
+
+ /** List of test cases to ignore, in lower cases. */
+ private val blackList = Set(
+ "blacklist.sql" // Do NOT remove this one. It is here to test the
blacklist functionality.
+ )
+
+ // Create all the test cases.
+ listTestCases().foreach(createScalaTestCase)
+
+ /** A test case. */
+ private case class TestCase(name: String, inputFile: String, resultFile:
String)
+
+ /** A single SQL query's output. */
+ private case class QueryOutput(sql: String, schema: String, output:
String) {
+ def toString(queryIndex: Int): String = {
+ // We are explicitly not using multi-line string due to stripMargin
removing "|" in output.
+ s"-- !query $queryIndex\n" +
+ sql + "\n" +
+ s"-- !query $queryIndex schema\n" +
+ schema + "\n" +
+ s"-- !query $queryIndex output\n" +
+ output
+ }
+ }
+
+ private def createScalaTestCase(testCase: TestCase): Unit = {
+ if (blackList.contains(testCase.name.toLowerCase)) {
+ // Create a test case to ignore this case.
+ ignore(testCase.name) { /* Do nothing */ }
+ } else {
+ // Create a test case to run this case.
+ test(testCase.name) { runTest(testCase) }
+ }
+ }
+
+ /** Run a test case. */
+ private def runTest(testCase: TestCase): Unit = {
+ val input = fileToString(new File(testCase.inputFile))
+
+ // List of SQL queries to run
+ val queries: Seq[String] = {
+ val cleaned =
input.split("\n").filterNot(_.startsWith("--")).mkString("\n")
+ // note: this is not a robust way to split queries using semicolon,
but works for now.
+ cleaned.split("(?<=[^\\\\]);").map(_.trim).filter(_ != "").toSeq
+ }
+
+ // Run the SQL queries preparing them for comparison.
+ val outputs: Seq[QueryOutput] = queries.map { sql =>
+ val df = spark.sql(sql)
+ // We might need to do some query canonicalization in the future.
+ QueryOutput(
+ sql = sql,
+ schema = df.schema.catalogString,
+ output = df.queryExecution.hiveResultString().mkString("\n"))
+ }
+
+ if (regenerateGoldenFiles) {
+ // Again, we are explicitly not using multi-line string due to
stripMargin removing "|".
+ val goldenOutput = {
+ s"-- Automatically generated by ${getClass.getName}\n" +
+ s"-- Number of queries: ${outputs.size}\n\n\n" +
+ outputs.zipWithIndex.map{case (qr, i) =>
qr.toString(i)}.mkString("\n\n\n") + "\n"
+ }
+ stringToFile(new File(testCase.resultFile), goldenOutput)
+ }
+
+ // Read back the golden file.
+ val expectedOutputs: Seq[QueryOutput] = {
+ val goldenOutput = fileToString(new File(testCase.resultFile))
+ val segments = goldenOutput.split("-- !query.+\n")
+ assert(segments.size == outputs.size * 3 + 1) // each query has 3
segments, plus the header
--- End diff --
Even if `segments.size == outputs.size * 3 + 1` fails, we can still finish
this branch right?
However if `(segments.size - 1) % 3 == 0` fails, we will throw
`ArrayIndexOutOfBound` in this branch.
Anyway it's bad to have dead code, if we wanna keep this assert, we should
remove
https://github.com/apache/spark/pull/14472/files#diff-432455394ca50800d5de508861984ca5R164
and move its error message here.
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