Examples with WindowFrame io.crate.sql.tree.WindowFrame used on opensource projects

Example 1 with WindowFrame

use of io.crate.sql.tree.WindowFrame in project crate by crate.

the class ExpressionAnalyzer method getWindowDefinition.

@Nullable
private WindowDefinition getWindowDefinition(Optional<Window> maybeWindow, ExpressionAnalysisContext context) {
    if (!maybeWindow.isPresent()) {
        return null;
    }
    var unresolvedWindow = maybeWindow.get();
    final Window window;
    if (unresolvedWindow.windowRef() != null) {
        var refWindow = resolveWindowRef(unresolvedWindow.windowRef(), context.windows());
        window = unresolvedWindow.merge(refWindow);
    } else {
        window = unresolvedWindow;
    }
    List<Symbol> partitionSymbols = new ArrayList<>(window.getPartitions().size());
    for (Expression partition : window.getPartitions()) {
        Symbol symbol = convert(partition, context);
        SemanticSortValidator.validate(symbol, "PARTITION BY");
        partitionSymbols.add(symbol);
    }
    OrderBy orderBy = OrderyByAnalyzer.analyzeSortItems(window.getOrderBy(), sortKey -> {
        Symbol symbol = convert(sortKey, context);
        SemanticSortValidator.validate(symbol);
        return symbol;
    });
    WindowFrameDefinition windowFrameDefinition = WindowDefinition.RANGE_UNBOUNDED_PRECEDING_CURRENT_ROW;
    if (window.getWindowFrame().isPresent()) {
        WindowFrame windowFrame = window.getWindowFrame().get();
        validateFrame(window, windowFrame);
        FrameBound start = windowFrame.getStart();
        FrameBoundDefinition startBound = convertToAnalyzedFrameBound(context, start);
        FrameBoundDefinition endBound = windowFrame.getEnd().map(end -> convertToAnalyzedFrameBound(context, end)).orElse(new FrameBoundDefinition(FrameBound.Type.CURRENT_ROW, Literal.NULL));
        windowFrameDefinition = new WindowFrameDefinition(windowFrame.mode(), startBound, endBound);
    }
    return new WindowDefinition(partitionSymbols, orderBy, windowFrameDefinition);
}