Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20647#discussion_r171143986
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/DataSourceV2StringFormat.scala
---
@@ -0,0 +1,94 @@
+/*
+ * 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.execution.datasources.v2
+
+import org.apache.commons.lang3.StringUtils
+
+import org.apache.spark.sql.catalyst.expressions.Attribute
+import org.apache.spark.sql.internal.SQLConf
+import org.apache.spark.sql.sources.DataSourceRegister
+import org.apache.spark.sql.sources.v2.DataSourceV2
+import org.apache.spark.sql.sources.v2.reader._
+import org.apache.spark.util.Utils
+
+/**
+ * A trait that can be used by data source v2 related query plans(both
logical and physical), to
+ * provide a string format of the data source information for explain.
+ */
+trait DataSourceV2StringFormat {
+
+ /**
+ * The instance of this data source implementation. Note that we only
consider its class in
+ * equals/hashCode, not the instance itself.
+ */
+ def source: DataSourceV2
+
+ /**
+ * The output of the data source reader, w.r.t. column pruning.
+ */
+ def output: Seq[Attribute]
+
+ /**
+ * The options for this data source reader.
+ */
+ def options: Map[String, String]
+
+ /**
+ * The created data source reader. Here we use it to get the filters
that has been pushed down
+ * so far, itself doesn't take part in the equals/hashCode.
+ */
+ def reader: DataSourceReader
+
+ private lazy val filters = reader match {
+ case s: SupportsPushDownCatalystFilters =>
s.pushedCatalystFilters().toSet
+ case s: SupportsPushDownFilters => s.pushedFilters().toSet
+ case _ => Set.empty
+ }
+
+ private def sourceName: String = source match {
+ case registered: DataSourceRegister => registered.shortName()
+ case _ => source.getClass.getSimpleName.stripSuffix("$")
+ }
+
+ def metadataString: String = {
+ val entries = scala.collection.mutable.ArrayBuffer.empty[(String,
String)]
+
+ if (filters.nonEmpty) {
+ entries += "Pushed Filters" -> filters.mkString("[", ", ", "]")
+ }
+
+ // TODO: we should only display some standard options like path,
table, etc.
+ entries ++= options
+
+ val outputStr = Utils.truncatedString(output, "[", ", ", "]")
+
+ val entriesStr = if (entries.nonEmpty) {
+ Utils.truncatedString(entries.map {
+ case (key, value) => StringUtils.abbreviate(redact(key + ":" +
value), 100)
--- End diff --
Now users can match password by `password:.+` to redact password.
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