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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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package org.apache.doris.spark.read

import org.apache.doris.spark.config.{DorisConfig, DorisOptions}
import org.apache.doris.spark.read.expression.V2ExpressionBuilder
import org.apache.spark.sql.connector.expressions.filter.Predicate
import org.apache.spark.sql.connector.read.{Scan, SupportsPushDownLimit, SupportsPushDownV2Filters}
import org.apache.spark.sql.types.StructType

class DorisScanBuilder(config: DorisConfig, schema: StructType) extends DorisScanBuilderBase(config, schema)
  with SupportsPushDownV2Filters
  with SupportsPushDownLimit {

  private var pushDownPredicates: Array[Predicate] = Array[Predicate]()

  private val expressionBuilder = new V2ExpressionBuilder(config.getValue(DorisOptions.DORIS_FILTER_QUERY_IN_MAX_COUNT))

  private var limitSize: Int = -1

  override def build(): Scan = new DorisScanV2(config, readSchema, pushDownPredicates, limitSize)

  override def pushPredicates(predicates: Array[Predicate]): Array[Predicate] = {
    val (pushed, unsupported) = predicates.partition(predicate => {
      expressionBuilder.buildOpt(predicate).isDefined
    })
    this.pushDownPredicates = pushed
    unsupported
  }

  override def pushedPredicates(): Array[Predicate] = pushDownPredicates

  override def pushLimit(i: Int): Boolean = {
    limitSize = i
    true
  }

}
