viirya commented on code in PR #50496: URL: https://github.com/apache/spark/pull/50496#discussion_r2025556441
########## sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/constraints.scala: ########## @@ -0,0 +1,179 @@ +/* + * 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.antlr.v4.runtime.ParserRuleContext + +import org.apache.spark.sql.catalyst.parser.ParseException +import org.apache.spark.sql.types.{DataType, StringType} + +trait TableConstraint { + + /** Returns the name of the constraint */ + def name: String + + /** Returns the characteristics of the constraint (e.g., ENFORCED, RELY) */ + def characteristic: ConstraintCharacteristic + + /** Creates a new constraint with the given name + * @param name Constraint name + * @return New TableConstraint instance + */ + def withName(name: String): TableConstraint + + /** Creates a new constraint with the given characteristic + * @param c Constraint characteristic (ENFORCED, RELY) + * @param ctx Parser context for error reporting + * @return New TableConstraint instance + */ + def withCharacteristic(c: ConstraintCharacteristic, ctx: ParserRuleContext): TableConstraint + + /** Generates a constraint name if one is not provided + * @param tableName Name of the table containing this constraint + * @return TableConstraint with a generated name if original name was null/empty + */ + def generateConstraintNameIfNeeded(tableName: String): TableConstraint = { + if (name == null || name.isEmpty) { + this.withName(name = generateConstraintName(tableName)) + } else { + this + } + } + + // Generate a constraint name based on the table name if the name is not specified + protected def generateConstraintName(tableName: String): String +} + +case class ConstraintCharacteristic(enforced: Option[Boolean], rely: Option[Boolean]) + +object ConstraintCharacteristic { + val empty: ConstraintCharacteristic = ConstraintCharacteristic(None, None) +} + +case class CheckConstraint( + child: Expression, + condition: String, + override val name: String = null, + override val characteristic: ConstraintCharacteristic = ConstraintCharacteristic.empty) + extends UnaryExpression + with Unevaluable + with TableConstraint { + + override protected def withNewChildInternal(newChild: Expression): Expression = + copy(child = newChild) + + override protected def generateConstraintName(tableName: String): String = { + val base = condition.filter(_.isLetterOrDigit).take(20) + val rand = scala.util.Random.alphanumeric.take(6).mkString + s"${tableName}_chk_${base}_$rand" + } + + override def sql: String = s"CONSTRAINT $name CHECK ($condition)" + + override def dataType: DataType = StringType + + override def withName(name: String): TableConstraint = copy(name = name) + + override def withCharacteristic( + c: ConstraintCharacteristic, + ctx: ParserRuleContext): TableConstraint = + copy(characteristic = c) +} + +case class PrimaryKeyConstraint( + columns: Seq[String], + override val name: String = null, + override val characteristic: ConstraintCharacteristic = ConstraintCharacteristic.empty) + extends TableConstraint { + override protected def generateConstraintName(tableName: String): String = s"${tableName}_pk" + + override def withName(name: String): TableConstraint = copy(name = name) + + override def withCharacteristic( + c: ConstraintCharacteristic, + ctx: ParserRuleContext): TableConstraint = { + if (c.enforced.contains(true)) { + throw new ParseException( + errorClass = "UNSUPPORTED_CONSTRAINT_CHARACTERISTIC", + messageParameters = Map( + "characteristic" -> "ENFORCED", + "constraintType" -> "PRIMARY KEY"), + ctx = ctx + ) + } + copy(characteristic = c) + } +} + +case class UniqueConstraint( + columns: Seq[String], + override val name: String = null, Review Comment: It seems more consistent (e.g., `ConstraintCharacteristic` uses `Option` to represent no `enforced` and `rely`. ########## sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/constraints.scala: ########## @@ -0,0 +1,179 @@ +/* + * 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.antlr.v4.runtime.ParserRuleContext + +import org.apache.spark.sql.catalyst.parser.ParseException +import org.apache.spark.sql.types.{DataType, StringType} + +trait TableConstraint { + + /** Returns the name of the constraint */ + def name: String + + /** Returns the characteristics of the constraint (e.g., ENFORCED, RELY) */ + def characteristic: ConstraintCharacteristic + + /** Creates a new constraint with the given name + * @param name Constraint name + * @return New TableConstraint instance + */ + def withName(name: String): TableConstraint + + /** Creates a new constraint with the given characteristic + * @param c Constraint characteristic (ENFORCED, RELY) + * @param ctx Parser context for error reporting + * @return New TableConstraint instance + */ + def withCharacteristic(c: ConstraintCharacteristic, ctx: ParserRuleContext): TableConstraint + + /** Generates a constraint name if one is not provided + * @param tableName Name of the table containing this constraint + * @return TableConstraint with a generated name if original name was null/empty + */ + def generateConstraintNameIfNeeded(tableName: String): TableConstraint = { + if (name == null || name.isEmpty) { + this.withName(name = generateConstraintName(tableName)) + } else { + this + } + } + + // Generate a constraint name based on the table name if the name is not specified + protected def generateConstraintName(tableName: String): String +} + +case class ConstraintCharacteristic(enforced: Option[Boolean], rely: Option[Boolean]) + +object ConstraintCharacteristic { + val empty: ConstraintCharacteristic = ConstraintCharacteristic(None, None) +} + +case class CheckConstraint( + child: Expression, + condition: String, + override val name: String = null, + override val characteristic: ConstraintCharacteristic = ConstraintCharacteristic.empty) + extends UnaryExpression + with Unevaluable + with TableConstraint { + + override protected def withNewChildInternal(newChild: Expression): Expression = + copy(child = newChild) + + override protected def generateConstraintName(tableName: String): String = { + val base = condition.filter(_.isLetterOrDigit).take(20) + val rand = scala.util.Random.alphanumeric.take(6).mkString + s"${tableName}_chk_${base}_$rand" + } + + override def sql: String = s"CONSTRAINT $name CHECK ($condition)" + + override def dataType: DataType = StringType + + override def withName(name: String): TableConstraint = copy(name = name) + + override def withCharacteristic( + c: ConstraintCharacteristic, + ctx: ParserRuleContext): TableConstraint = + copy(characteristic = c) +} + +case class PrimaryKeyConstraint( + columns: Seq[String], + override val name: String = null, + override val characteristic: ConstraintCharacteristic = ConstraintCharacteristic.empty) + extends TableConstraint { + override protected def generateConstraintName(tableName: String): String = s"${tableName}_pk" + + override def withName(name: String): TableConstraint = copy(name = name) + + override def withCharacteristic( + c: ConstraintCharacteristic, + ctx: ParserRuleContext): TableConstraint = { + if (c.enforced.contains(true)) { + throw new ParseException( + errorClass = "UNSUPPORTED_CONSTRAINT_CHARACTERISTIC", + messageParameters = Map( + "characteristic" -> "ENFORCED", + "constraintType" -> "PRIMARY KEY"), + ctx = ctx + ) + } + copy(characteristic = c) + } +} + +case class UniqueConstraint( + columns: Seq[String], + override val name: String = null, Review Comment: It seems more consistent (e.g., `ConstraintCharacteristic` uses `Option` to represent no `enforced` and `rely`). -- This is an automated message from the Apache Git Service. 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