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Adds operand concept for handling vararg inputs
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39 changes: 10 additions & 29 deletions
39
partiql-eval/src/main/java/org/partiql/eval/compiler/Match.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,50 +1,31 @@ | ||
| package org.partiql.eval.compiler; | ||
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| import org.jetbrains.annotations.NotNull; | ||
| import org.partiql.eval.Expr; | ||
| import org.partiql.plan.Operator; | ||
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| import java.util.Collections; | ||
| import java.util.List; | ||
| import org.partiql.plan.Operand; | ||
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| /** | ||
| * Match represents a subtree match to be sent to the | ||
| */ | ||
| public class Match { | ||
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| private final Operator[] operators; | ||
| private final List<List<Expr>> children; | ||
| private final Operand[] operands; | ||
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| /** | ||
| * Single operator match with zero-or-more inputs. | ||
| * Single operand match with zero-or-more inputs. | ||
| * | ||
| * @param operator matched logical operator. | ||
| * @param children compiled child operators. | ||
| * @param operand matched logical operand. | ||
| */ | ||
| public Match(@NotNull Operator operator, @NotNull List<Expr> children) { | ||
| this.operators = new Operator[]{operator}; | ||
| this.children = Collections.singletonList(children); | ||
| } | ||
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| /** | ||
| * Get the i-th operator (pre-order) matched by the pattern. | ||
| * | ||
| * @param i 0-indexed | ||
| * @return Operator | ||
| */ | ||
| @NotNull | ||
| public Operator operator(int i) { | ||
| return operators[i]; | ||
| public Match(@NotNull Operand operand) { | ||
| this.operands = new Operand[]{operand}; | ||
| } | ||
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| /** | ||
| * Get the i-th input to this pattern. | ||
| * Get the first (or only) operand | ||
| * | ||
| * @param i 0-indexed | ||
| * @return Expr | ||
| * @return Operand | ||
| */ | ||
| @NotNull | ||
| public List<Expr> children(int i) { | ||
| return children.get(i); | ||
| public Operand getOperand() { | ||
| return operands[0]; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| package org.partiql.plan; | ||
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| import org.jetbrains.annotations.NotNull; | ||
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| import java.util.Iterator; | ||
| import java.util.List; | ||
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| /** | ||
| * Operands in an operator tree used for strategy and rule pattern matching. | ||
| */ | ||
| public interface Operand extends Iterable<Operator> { | ||
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| /** | ||
| * @return a single operand | ||
| */ | ||
| public static Operand single(Operator operator) { | ||
| return new Single(operator); | ||
| } | ||
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| /** | ||
| * @return a variadic operand | ||
| * | ||
| * See ImmutableCollections.java ListCopy. | ||
| */ | ||
| @SuppressWarnings("unchecked") | ||
| public static Operand vararg(List<? extends Operator> operators) { | ||
| return new Variadic((List<Operator>) operators); | ||
| } | ||
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| /** | ||
| * A single operator. | ||
| */ | ||
| public class Single implements Operand { | ||
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| @NotNull | ||
| public final Operator operator; | ||
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| private Single(@NotNull Operator operator) { | ||
| this.operator = operator; | ||
| } | ||
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| @NotNull | ||
| @Override | ||
| public Iterator<Operator> iterator() { | ||
| return List.of(operator).iterator(); | ||
| } | ||
| } | ||
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| /** | ||
| * A variadic operator. | ||
| */ | ||
| public class Variadic implements Operand { | ||
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| @NotNull | ||
| public final List<Operator> operators; | ||
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| private Variadic(@NotNull List<Operator> operators) { | ||
| this.operators = operators; | ||
| } | ||
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| @NotNull | ||
| @Override | ||
| public Iterator<Operator> iterator() { | ||
| return operators.iterator(); | ||
| } | ||
| } | ||
| } |
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