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82 changes: 82 additions & 0 deletions
82
partiql-eval/src/main/java/org/partiql/eval/Environment.java
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|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| package org.partiql.eval; | ||
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| import org.partiql.spi.value.Datum; | ||
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| /** | ||
| * This class holds the evaluation environment. | ||
| * <br> | ||
| * Developer Note: Attempts have been made at an interpreter stack, but has not worked well with nested lazy values. | ||
| * For example, an expression may return an inner lazy value (think subqueries), but the stack state may have changed | ||
| * BEFORE the inner lazy value is accessed. Here is my best attempt at illustrating this, | ||
| * <code> | ||
| * 0: +-PUSH(row) | ||
| * 1: +--|----bag.eval() // lazy iterator (push/pop and eval variables) | ||
| * 2: | +-POP | ||
| * 3: | | ||
| * 4: +-- .next() // woah! we called bag.next() from line:1, but we popped on line:2 so line:1 is invalid! | ||
| * </code> | ||
| * <br> | ||
| * The most basic solution we have is to pass a new environment into each nested scope. | ||
| */ | ||
| public class Environment { | ||
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| private final Row[] stack; | ||
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| /** | ||
| * Default constructor with empty stack. | ||
| */ | ||
| public Environment() { | ||
| this.stack = new Row[]{}; | ||
| } | ||
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| /** | ||
| * Private constructor with given stack. | ||
| * @param stack | ||
| */ | ||
| private Environment(Row[] stack) { | ||
| this.stack = stack; | ||
| } | ||
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| /** | ||
| * Push a new row onto the stack. | ||
| */ | ||
| public Environment push(Row row) { | ||
| int n = stack.length; | ||
| Row[] next = new Row[n + 1]; | ||
| next[0] = row; | ||
| if (n > 0) { | ||
| System.arraycopy(stack, 0, next, 1, n); | ||
| } | ||
| return new Environment(next); | ||
| } | ||
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| /** | ||
| * Returns the variable at the specified depth and offset. | ||
| * | ||
| * @param depth Scope depth. | ||
| * @param offset Variable offset. | ||
| * @return Datum. | ||
| */ | ||
| public Datum get(int depth, int offset) { | ||
| try { | ||
| return stack[depth].values[offset]; | ||
| } catch (IndexOutOfBoundsException ex) { | ||
| throw new RuntimeException("Invalid variable reference [$depth:$offset]\n$this"); | ||
| } | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| StringBuilder sb = new StringBuilder(); | ||
| sb.append("[stack]--------------\n"); | ||
| for (int i = 0; i < stack.length; i++) { | ||
| sb.append("$i: $row"); | ||
| sb.append("---------------------"); | ||
| } | ||
| // if (scope.isEmpty()) { | ||
| // appendLine("empty") | ||
| // appendLine("---------------------") | ||
| // } | ||
| return "stack"; | ||
| } | ||
| } |
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partiql-eval/src/main/java/org/partiql/eval/PartiQLCompiler.java
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partiql-eval/src/main/java/org/partiql/eval/PartiQLEvaluator.java
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