def pushFilters()

in phoenix5-spark3/src/main/scala/org/apache/phoenix/spark/FilterExpressionCompiler.scala [39:98]
53 lines of code
22 McCabe index (conditional complexity)

  def pushFilters(filters: Array[Filter]): (String, Array[Filter], Array[Filter]) = {
    if (filters.isEmpty) {
      return ("" , Array[Filter](), Array[Filter]())
    }

    val filter = new StringBuilder("")
    val unsupportedFilters = Array[Filter]();
    var i = 0

    filters.foreach(f => {
      // Assume conjunction for multiple filters, unless otherwise specified
      if (i > 0) {
        filter.append(" AND")
      }

      f match {
        // Spark 1.3.1+ supported filters
        case And(leftFilter, rightFilter)  => {
          val(whereClause, currUnsupportedFilters, _) = pushFilters(Array(leftFilter, rightFilter))
          if (currUnsupportedFilters.isEmpty)
            filter.append(whereClause)
          else
            unsupportedFilters :+ f
        }
        case Or(leftFilter, rightFilter) => {
          val(whereLeftClause, leftUnsupportedFilters, _) = pushFilters(Array(leftFilter))
          val(whereRightClause, rightUnsupportedFilters, _) = pushFilters(Array(rightFilter))
          if (leftUnsupportedFilters.isEmpty && rightUnsupportedFilters.isEmpty) {
            filter.append("(" + whereLeftClause + " OR " + whereRightClause + ")")
          }
          else {
            unsupportedFilters :+ f
          }
        }
        case Not(aFilter) => {
          val(whereClause, currUnsupportedFilters, _) = pushFilters(Array(aFilter))
          if (currUnsupportedFilters.isEmpty)
            filter.append(" NOT " + whereClause)
          else
            unsupportedFilters :+ f
        }
        case EqualTo(attr, value) => filter.append(s" ${escapeKey(attr)} = ${compileValue(value)}")
        case GreaterThan(attr, value) => filter.append(s" ${escapeKey(attr)} > ${compileValue(value)}")
        case GreaterThanOrEqual(attr, value) => filter.append(s" ${escapeKey(attr)} >= ${compileValue(value)}")
        case LessThan(attr, value) => filter.append(s" ${escapeKey(attr)} < ${compileValue(value)}")
        case LessThanOrEqual(attr, value) => filter.append(s" ${escapeKey(attr)} <= ${compileValue(value)}")
        case IsNull(attr) => filter.append(s" ${escapeKey(attr)} IS NULL")
        case IsNotNull(attr) => filter.append(s" ${escapeKey(attr)} IS NOT NULL")
        case In(attr, values) => filter.append(s" ${escapeKey(attr)} IN ${values.map(compileValue).mkString("(", ",", ")")}")
        case StringStartsWith(attr, value) => filter.append(s" ${escapeKey(attr)} LIKE ${compileValue(value + "%")}")
        case StringEndsWith(attr, value) => filter.append(s" ${escapeKey(attr)} LIKE ${compileValue("%" + value)}")
        case StringContains(attr, value) => filter.append(s" ${escapeKey(attr)} LIKE ${compileValue("%" + value + "%")}")
        case _ => unsupportedFilters :+ f
      }

      i = i + 1
    })

    (filter.toString(), unsupportedFilters, filters diff unsupportedFilters)
  }