Examples with ConstantPageProjection io.trino.operator.project.ConstantPageProjection used on opensource projects

Example 1 with ConstantPageProjection

use of io.trino.operator.project.ConstantPageProjection in project trino by trinodb.

the class PageFunctionCompiler method compileProjectionInternal.

private Supplier<PageProjection> compileProjectionInternal(RowExpression projection, Optional<String> classNameSuffix) {
    requireNonNull(projection, "projection is null");
    if (projection instanceof InputReferenceExpression) {
        InputReferenceExpression input = (InputReferenceExpression) projection;
        InputPageProjection projectionFunction = new InputPageProjection(input.getField(), input.getType());
        return () -> projectionFunction;
    }
    if (projection instanceof ConstantExpression) {
        ConstantExpression constant = (ConstantExpression) projection;
        ConstantPageProjection projectionFunction = new ConstantPageProjection(constant.getValue(), constant.getType());
        return () -> projectionFunction;
    }
    PageFieldsToInputParametersRewriter.Result result = rewritePageFieldsToInputParameters(projection);
    CallSiteBinder callSiteBinder = new CallSiteBinder();
    // generate Work
    ClassDefinition pageProjectionWorkDefinition = definePageProjectWorkClass(result.getRewrittenExpression(), callSiteBinder, classNameSuffix);
    Class<?> pageProjectionWorkClass;
    try {
        pageProjectionWorkClass = defineClass(pageProjectionWorkDefinition, Work.class, callSiteBinder.getBindings(), getClass().getClassLoader());
    } catch (Exception e) {
        if (Throwables.getRootCause(e) instanceof MethodTooLargeException) {
            throw new TrinoException(COMPILER_ERROR, "Query exceeded maximum columns. Please reduce the number of columns referenced and re-run the query.", e);
        }
        throw new TrinoException(COMPILER_ERROR, e);
    }
    return () -> new GeneratedPageProjection(result.getRewrittenExpression(), isDeterministic(result.getRewrittenExpression()), result.getInputChannels(), constructorMethodHandle(pageProjectionWorkClass, BlockBuilder.class, ConnectorSession.class, Page.class, SelectedPositions.class));
}