Github user mallman commented on a diff in the pull request: https://github.com/apache/spark/pull/17633#discussion_r113591167 --- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveShim.scala --- @@ -589,18 +590,34 @@ private[client] class Shim_v0_13 extends Shim_v0_12 { col.getType.startsWith(serdeConstants.CHAR_TYPE_NAME)) .map(col => col.getName).toSet - filters.collect { - case op @ BinaryComparison(a: Attribute, Literal(v, _: IntegralType)) => - s"${a.name} ${op.symbol} $v" - case op @ BinaryComparison(Literal(v, _: IntegralType), a: Attribute) => - s"$v ${op.symbol} ${a.name}" - case op @ BinaryComparison(a: Attribute, Literal(v, _: StringType)) - if !varcharKeys.contains(a.name) => - s"""${a.name} ${op.symbol} ${quoteStringLiteral(v.toString)}""" - case op @ BinaryComparison(Literal(v, _: StringType), a: Attribute) - if !varcharKeys.contains(a.name) => - s"""${quoteStringLiteral(v.toString)} ${op.symbol} ${a.name}""" - }.mkString(" and ") + def isFoldable(expr: Expression): Boolean = + (expr.dataType.isInstanceOf[IntegralType] || expr.dataType.isInstanceOf[StringType]) && + expr.foldable && + expr.deterministic + + def convertFoldable(expr: Expression): String = expr.dataType match { + case _: IntegralType => expr.eval(null).toString + case _: StringType => quoteStringLiteral(expr.eval(null).toString) + } + + def convert(filter: Expression): String = + filter match { + case In(a: Attribute, exprs) if exprs.forall(isFoldable) => + val or = exprs.map(expr => s"${a.name} = ${convertFoldable(expr)}").reduce(_ + " or " + _) + "(" + or + ")" + case op @ BinaryComparison(a: Attribute, expr2) + if !varcharKeys.contains(a.name) && isFoldable(expr2) => + s"(${a.name} ${op.symbol} ${convertFoldable(expr2)})" + case op @ BinaryComparison(expr1, a: Attribute) + if !varcharKeys.contains(a.name) && isFoldable(expr1) => + s"(${convertFoldable(expr1)} ${op.symbol} ${a.name})" + case op @ And(expr1, expr2) => + s"(${convert(expr1)} and ${convert(expr2)})" + case op @ Or(expr1, expr2) => + s"(${convert(expr1)} or ${convert(expr2)})" + } + + filters.flatMap(f => Try(convert(f)).toOption).mkString(" and ") --- End diff -- The `convert` method throws a `MatchError` if an expression is not a compatible Hive partition filter. Otherwise it returns a compatible partition pruning string. While using exception handling in this way can certainly be considered an anti-pattern, it does make for a much simpler implementation and type signature of the `convert` method.
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