/
Predicate.scala
184 lines (157 loc) · 6.7 KB
/
Predicate.scala
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package me.lyh.parquet.avro
import org.apache.avro.Schema
import org.apache.avro.specific.{SpecificRecord => SR}
import org.apache.parquet.filter2.predicate.FilterPredicate
import scala.language.experimental.macros
import scala.reflect.macros._
case class Predicates[T](native: T => Boolean, parquet: FilterPredicate)
object Predicate {
def apply[T <: SR](p: T => Boolean): FilterPredicate = macro applyImpl[T]
def applyImpl[T <: SR: c.WeakTypeTag](c: blackbox.Context)(
p: c.Expr[T => Boolean]
): c.Expr[FilterPredicate] = buildFilterPredicate(c)(p)
def build[T <: SR](p: T => Boolean): Predicates[T] = macro buildImpl[T]
def buildImpl[T <: SR: c.WeakTypeTag](
c: blackbox.Context
)(p: c.Expr[T => Boolean]): c.Expr[Predicates[T]] = {
import c.universe._
val f = buildFilterPredicate(c)(p)
c.Expr(q"_root_.me.lyh.parquet.avro.Predicates($p, $f)").asInstanceOf[c.Expr[Predicates[T]]]
}
private val logicalOps = Map("$amp$amp" -> "and", "$bar$bar" -> "or")
private val compareOps = Map(
"$greater" -> "gt",
"$less" -> "lt",
"$greater$eq" -> "gtEq",
"$less$eq" -> "ltEq",
"$eq$eq" -> "eq",
"$bang$eq" -> "notEq"
)
private val numericTypes = Map(
Schema.Type.INT -> ("Integer", "intColumn", "toInt"),
Schema.Type.LONG -> ("Long", "longColumn", "toLong"),
Schema.Type.FLOAT -> ("Float", "floatColumn", "toFloat"),
Schema.Type.DOUBLE -> ("Double", "doubleColumn", "toDouble")
)
private def buildFilterPredicate[T <: SR: c.WeakTypeTag](
c: blackbox.Context
)(p: c.Expr[T => Boolean]): c.Expr[FilterPredicate] = {
import c.universe._
val ns = q"_root_.org.apache.parquet.filter2.predicate"
val nsApi = q"$ns.FilterApi"
val nsOp = q"$ns.Operators"
val schema = Class
.forName(implicitly[WeakTypeTag[T]].tpe.typeSymbol.fullName)
.getMethod("getClassSchema")
.invoke(null)
.asInstanceOf[Schema]
def mkPredicateFn(columnType: Tree, columnFn: String, value: Tree): (String, String) => Tree = {
val vt = tq"$columnType with Comparable[$columnType]"
val supportsLtGt = tq"$nsOp.SupportsLtGt"
val ct = tq"$nsOp.Column[$columnType] with $supportsLtGt"
(columnPath: String, operator: String) => {
val opFn = TermName(operator)
val cFn = TermName(columnFn)
val colVal = q"$nsApi.$cFn($columnPath)"
q"$nsApi.$opFn($colVal.asInstanceOf[$ct], $value.asInstanceOf[$vt])"
}
}
def applyToPredicate(tree: Tree): c.Expr[FilterPredicate] = {
val Apply(Select(lExpr, operator), List(rExpr)) = tree
def extractGetter(expr: Tree): Option[(String, Schema.Type)] =
try {
val getter = expr match {
case Apply(_, List(g)) => g
case t => t
}
val (fieldName, fieldType) =
Common.treeToField(c)(schema, c.Expr[T => Any](q"(x: Any) => $getter"))
if (fieldName != "" && fieldType != Schema.Type.NULL) Some((fieldName, fieldType))
else None
} catch {
case _: Exception => None
}
val logicalOp = logicalOps.get(operator.toString)
if (logicalOp.isDefined) {
// expr1 AND|OR expr2
val (op, l, r) = (TermName(logicalOp.get), parse(lExpr), parse(rExpr))
c.Expr(q"$ns.FilterApi.$op($l, $r)").asInstanceOf[c.Expr[FilterPredicate]]
} else {
// expr1 COMP expr2
val (flipped, (fieldName, fieldType), valueExpr) =
(extractGetter(lExpr), extractGetter(rExpr)) match {
case (Some(g), None) => (false, g, rExpr) // getter COMP value
case (None, Some(g)) => (true, g, lExpr) // value COMP getter
case _ => throw new RuntimeException("Invalid expression: " + tree)
}
def flip(op: String) =
if (op.startsWith("gt")) {
"lt" + op.substring(2)
} else if (op.startsWith("lt")) {
"gt" + op.substring(2)
} else {
op
}
if (operator.toString == "Boolean2boolean") {
// implicit boolean predicate, e.g. (_.isValid)
val predicateFn = mkPredicateFn(tq"java.lang.Boolean", "booleanColumn", q"true")
c.Expr(predicateFn(fieldName, "eq")).asInstanceOf[c.Expr[FilterPredicate]]
} else {
// value can be a null literal with no {toInt, toLong, ...} methods
val isNullLiteral =
try {
val Literal(Constant(null)) = valueExpr
true
} catch {
case _: Exception => false
}
val predicateFn = fieldType match {
case t if numericTypes.contains(t) =>
val (cType, cFn, vFn) = numericTypes(t)
val cTypeName = tq"java.lang.${TypeName(cType)}"
val vFnName = TermName(vFn)
val nullCase = cq"_: NullPointerException => null"
val value = if (isNullLiteral) {
q"null"
} else {
q"(if (_root_.me.lyh.parquet.avro.Common.isNull($valueExpr)) null else try { $valueExpr.$vFnName } catch { case $nullCase })"
}
mkPredicateFn(cTypeName, cFn, value)
case Schema.Type.BOOLEAN =>
val value = if (isNullLiteral) q"null" else valueExpr
mkPredicateFn(tq"java.lang.Boolean", "booleanColumn", value)
case Schema.Type.STRING =>
val ns = q"_root_.org.apache.parquet.io.api"
val value = if (isNullLiteral) q"null" else q"$ns.Binary.fromString($valueExpr)"
mkPredicateFn(tq"$ns.Binary", "binaryColumn", value)
case _ => throw new RuntimeException("Unsupported value type: " + fieldType)
}
if (!compareOps.contains(operator.toString)) {
throw new RuntimeException("Unsupported operator type: " + operator)
}
val op = compareOps(operator.toString)
val realOp = if (flipped) flip(op) else op
c.Expr(predicateFn(fieldName, realOp)).asInstanceOf[c.Expr[FilterPredicate]]
}
}
}
def selectToPredicate(tree: Tree): c.Expr[FilterPredicate] = {
val Select(expr, operator) = tree
if (operator.toString == "unary_$bang") {
val p = parse(expr)
c.Expr(q"$nsApi.not($p)").asInstanceOf[c.Expr[FilterPredicate]]
} else {
throw new RuntimeException("Unknown unary operator: " + operator)
}
}
def parse(tree: Tree): c.Expr[FilterPredicate] = {
tree match {
case Apply(_, _) => applyToPredicate(tree)
case Select(_, _) => selectToPredicate(tree)
case _ => throw new RuntimeException("Invalid expression: " + tree)
}
}
val Function(_, body) = p.tree
parse(body)
}
}