dtenedor commented on code in PR #38065: URL: https://github.com/apache/spark/pull/38065#discussion_r988390351
########## sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/redactionExpressions.scala: ########## @@ -0,0 +1,237 @@ +/* + * 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 java.util.Locale + +import org.apache.spark.sql.catalyst.analysis.TypeCheckResult +import org.apache.spark.sql.catalyst.expressions.codegen._ +import org.apache.spark.sql.catalyst.expressions.codegen.Block.BlockHelper +import org.apache.spark.sql.errors.{QueryCompilationErrors, QueryExecutionErrors} +import org.apache.spark.sql.types.{DataType, StringType} +import org.apache.spark.unsafe.types.UTF8String + +/** + * A function that converts a string representing a credit card number in a form updated to mask the + * digits in the interest of redacting the information. Returns an error if the format string is + * invalid or if the input string does not match the format string. + */ +@ExpressionDescription( + usage = """ + _FUNC_(input) - Convert string 'input' representing a credit card number to an updated version + applying a transformation to the characters. This can be useful for creating copies of tables + with sensitive information removed, but retaining the same schema. Returns an error if the + format string is invalid or if the input string does not match the format string. + The format can consist of the following characters, case insensitive: + - Each 'X' represents a digit which will be converted to 'X' in the result. + - Each digit '0'-'9' represents a digit which will be left unchanged in the result. + - Each '-' character should match exactly in the input string. + - Each whitespace character is ignored. + No other format characters are allowed. Any whitespace in the input string is left unchanged. + The default is: XXXX-XXXX-XXXX-XXXX. + """, + examples = """ + Examples: + > SELECT _FUNC_(ccn) FROM VALUES ("1234-5678-9876-5432") AS tab(ccn); + XXXX-XXXX-XXXX-XXXX + > SELECT _FUNC_(" 1234 5678 9876 5432", "XXXX XXXX XXXX 1234"); + XXXX XXXX XXXX 5432 + """, + since = "3.4.0", + group = "string_funcs" +) +case class MaskCcn(left: Expression, right: Expression) + extends MaskDigitSequence(left, right, "mask_ccn", false) { + def this(left: Expression) = this(left, Literal(MaskCcn.DEFAULT_FORMAT)) + override protected def withNewChildrenInternal( + newInput: Expression, newFormat: Expression): MaskCcn = + copy(left = newInput, right = newFormat) +} + +/** + * A function that converts a string representing a credit card number in a form updated to mask the + * digits in the interest of redacting the information. Returns an error if the format string is + * invalid or NULL if the input string does not match the format string. + */ +@ExpressionDescription( + usage = """ + _FUNC_(input) - Convert string 'input' representing a credit card number to an updated version + applying a transformation to the characters. This can be useful for creating copies of tables + with sensitive information removed, but retaining the same schema. Returns an error if the + format string is invalid or NULL if the input string does not match the format string. + The format can consist of the following characters, case insensitive: + - Each 'X' represents a digit which will be converted to 'X' in the result. + - Each digit '0'-'9' represents a digit which will be left unchanged in the result. + - Each '-' character should match exactly in the input string. + - Each whitespace character is ignored. + No other format characters are allowed. Any whitespace in the input string is left unchanged. + The default is: XXXX-XXXX-XXXX-XXXX. + """, + examples = """ + Examples: + > SELECT _FUNC_(ccn) FROM VALUES ("1234-5678-9876-5432") AS tab(ccn); + XXXX-XXXX-XXXX-XXXX + > SELECT _FUNC_(" 1234 5678 9876 5432", "XXXX XXXX XXXX 1234"); + XXXX XXXX XXXX 5432 + > SELECT _FUNC_("1234567898765432"); + NULL + > SELECT _FUNC_("1234567898765432", "XXXX-XXXX-XXXX-1234"); + NULL + """, + since = "3.4.0", + group = "string_funcs" +) +case class TryMaskCcn(left: Expression, right: Expression) + extends MaskDigitSequence(left, right, "try_mask_ccn", true) { + def this(left: Expression) = this(left, Literal(MaskCcn.DEFAULT_FORMAT)) + override protected def withNewChildrenInternal( + newInput: Expression, newFormat: Expression): TryMaskCcn = + copy(left = newInput, right = newFormat) + override def nullable: Boolean = true +} + +/** Companion object for the MaskCcn and TryMaskCcn classes. */ +object MaskCcn { + val DEFAULT_FORMAT = "XXXX-XXXX-XXXX-XXXX" +} + +/** Implementation of an expression to mask digits in a string to replacement characters. */ +abstract class MaskDigitSequence( + left: Expression, right: Expression, functionName: String, nullOnError: Boolean) + extends BinaryExpression with ImplicitCastInputTypes with NullIntolerant with Serializable { Review Comment: This is needed, it makes the subclass Expression serializable. Removing it causes the tests to fail with serialization exceptions. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
