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/*
* 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.sources
////////////////////////////////////////////////////////////////////////////////////////////////////
// This file defines all the filters that we can push down to the data sources.
////////////////////////////////////////////////////////////////////////////////////////////////////
/**
* A filter predicate for data sources.
*
* @since 1.3.0
*/
abstract class Filter
/**
* A filter that evaluates to `true` iff the attribute evaluates to a value
* equal to `value`.
*
* @since 1.3.0
*/
case class EqualTo(attribute: String, value: Any) extends Filter
/**
* Performs equality comparison, similar to [[EqualTo]]. However, this differs from [[EqualTo]]
* in that it returns `true` (rather than NULL) if both inputs are NULL, and `false`
* (rather than NULL) if one of the input is NULL and the other is not NULL.
*
* @since 1.5.0
*/
case class EqualNullSafe(attribute: String, value: Any) extends Filter
/**
* A filter that evaluates to `true` iff the attribute evaluates to a value
* greater than `value`.
*
* @since 1.3.0
*/
case class GreaterThan(attribute: String, value: Any) extends Filter
/**
* A filter that evaluates to `true` iff the attribute evaluates to a value
* greater than or equal to `value`.
*
* @since 1.3.0
*/
case class GreaterThanOrEqual(attribute: String, value: Any) extends Filter
/**
* A filter that evaluates to `true` iff the attribute evaluates to a value
* less than `value`.
*
* @since 1.3.0
*/
case class LessThan(attribute: String, value: Any) extends Filter
/**
* A filter that evaluates to `true` iff the attribute evaluates to a value
* less than or equal to `value`.
*
* @since 1.3.0
*/
case class LessThanOrEqual(attribute: String, value: Any) extends Filter
/**
* A filter that evaluates to `true` iff the attribute evaluates to one of the values in the array.
*
* @since 1.3.0
*/
case class In(attribute: String, values: Array[Any]) extends Filter {
override def hashCode(): Int = {
var h = attribute.hashCode
values.foreach { v =>
h *= 41
h += v.hashCode()
}
h
}
override def equals(o: Any): Boolean = o match {
case In(a, vs) =>
a == attribute && vs.length == values.length && vs.zip(values).forall(x => x._1 == x._2)
case _ => false
}
override def toString: String = {
s"In($attribute, [${values.mkString(",")}]"
}
}
/**
* A filter that evaluates to `true` iff the attribute evaluates to null.
*
* @since 1.3.0
*/
case class IsNull(attribute: String) extends Filter
/**
* A filter that evaluates to `true` iff the attribute evaluates to a non-null value.
*
* @since 1.3.0
*/
case class IsNotNull(attribute: String) extends Filter
/**
* A filter that evaluates to `true` iff both `left` or `right` evaluate to `true`.
*
* @since 1.3.0
*/
case class And(left: Filter, right: Filter) extends Filter
/**
* A filter that evaluates to `true` iff at least one of `left` or `right` evaluates to `true`.
*
* @since 1.3.0
*/
case class Or(left: Filter, right: Filter) extends Filter
/**
* A filter that evaluates to `true` iff `child` is evaluated to `false`.
*
* @since 1.3.0
*/
case class Not(child: Filter) extends Filter
/**
* A filter that evaluates to `true` iff the attribute evaluates to
* a string that starts with `value`.
*
* @since 1.3.1
*/
case class StringStartsWith(attribute: String, value: String) extends Filter
/**
* A filter that evaluates to `true` iff the attribute evaluates to
* a string that starts with `value`.
*
* @since 1.3.1
*/
case class StringEndsWith(attribute: String, value: String) extends Filter
/**
* A filter that evaluates to `true` iff the attribute evaluates to
* a string that contains the string `value`.
*
* @since 1.3.1
*/
case class StringContains(attribute: String, value: String) extends Filter
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