Examples with ConstantPageProjection com.facebook.presto.operator.project.ConstantPageProjection used on opensource projects

Example 1 with ConstantPageProjection

use of com.facebook.presto.operator.project.ConstantPageProjection in project presto by prestodb.

the class PageFunctionCompiler method compileProjection.

private Supplier<PageProjection> compileProjection(SqlFunctionProperties sqlFunctionProperties, Map<SqlFunctionId, SqlInvokedFunction> sessionFunctions, RowExpression projection, Optional<String> classNameSuffix) {
    if (projection instanceof InputReferenceExpression) {
        InputReferenceExpression input = (InputReferenceExpression) projection;
        InputPageProjection projectionFunction = new InputPageProjection(input.getField());
        return () -> projectionFunction;
    }
    if (projection instanceof ConstantExpression) {
        ConstantExpression constant = (ConstantExpression) projection;
        ConstantPageProjection projectionFunction = new ConstantPageProjection(constant.getValue(), constant.getType());
        return () -> projectionFunction;
    }
    return compileProjectionCached(sqlFunctionProperties, sessionFunctions, ImmutableList.of(projection), false, classNameSuffix);
}