Examples with NullIfExpression io.confluent.ksql.parser.tree.NullIfExpression used on opensource projects

Example 1 with NullIfExpression

use of io.confluent.ksql.parser.tree.NullIfExpression in project ksql by confluentinc.

the class AstBuilder method visitFunctionCall.

@Override
public Node visitFunctionCall(SqlBaseParser.FunctionCallContext context) {
    Optional<Window> window = visitIfPresent(context.over(), Window.class);
    QualifiedName name = getQualifiedName(context.qualifiedName());
    boolean distinct = false;
    if (name.toString().equals("NULLIF")) {
        check(context.expression().size() == 2, "Invalid number of arguments for 'nullif' function", context);
        check(!window.isPresent(), "OVER clause not valid for 'nullif' function", context);
        check(!distinct, "DISTINCT not valid for 'nullif' function", context);
        return new NullIfExpression(getLocation(context), (Expression) visit(context.expression(0)), (Expression) visit(context.expression(1)));
    }
    return new FunctionCall(getLocation(context), getQualifiedName(context.qualifiedName()), window, distinct, visit(context.expression(), Expression.class));
}