Examples with FetchFirst io.prestosql.sql.tree.FetchFirst used on opensource projects

Example 1 with FetchFirst

use of io.prestosql.sql.tree.FetchFirst in project hetu-core by openlookeng.

the class AstBuilder method visitQueryNoWith.

@Override
public Node visitQueryNoWith(SqlBaseParser.QueryNoWithContext context) {
    QueryBody term = (QueryBody) visit(context.queryTerm());
    Optional<OrderBy> orderBy = Optional.empty();
    if (context.ORDER() != null) {
        orderBy = Optional.of(new OrderBy(getLocation(context.ORDER()), visit(context.sortItem(), SortItem.class)));
    }
    Optional<Node> limit = Optional.empty();
    if (context.FETCH() != null) {
        limit = Optional.of(new FetchFirst(Optional.of(getLocation(context.FETCH())), getTextIfPresent(context.fetchFirst), context.TIES() != null));
    } else if (context.LIMIT() != null) {
        limit = Optional.of(new Limit(Optional.of(getLocation(context.LIMIT())), getTextIfPresent(context.limit).orElseThrow(() -> new IllegalStateException("Missing LIMIT value"))));
    }
    Optional<Offset> offset = Optional.empty();
    if (context.OFFSET() != null) {
        offset = Optional.of(new Offset(Optional.of(getLocation(context.OFFSET())), getTextIfPresent(context.offset).orElseThrow(() -> new IllegalStateException("Missing OFFSET row count"))));
    }
    if (term instanceof QuerySpecification) {
        // When we have a simple query specification
        // followed by order by, offset, limit or fetch,
        // fold the order by, limit, offset or fetch clauses
        // into the query specification (analyzer/planner
        // expects this structure to resolve references with respect
        // to columns defined in the query specification)
        QuerySpecification query = (QuerySpecification) term;
        return new Query(getLocation(context), Optional.empty(), new QuerySpecification(getLocation(context), query.getSelect(), query.getFrom(), query.getWhere(), query.getGroupBy(), query.getHaving(), orderBy, offset, limit), Optional.empty(), Optional.empty(), Optional.empty());
    }
    return new Query(getLocation(context), Optional.empty(), term, orderBy, offset, limit);
}

Example 2 with FetchFirst

use of io.prestosql.sql.tree.FetchFirst in project hetu-core by openlookeng.

the class TestSqlParser method testSelectWithFetch.

@Test
public void testSelectWithFetch() {
    assertStatement("SELECT * FROM table1 FETCH FIRST 2 ROWS ONLY", new Query(Optional.empty(), new QuerySpecification(selectList(new AllColumns()), Optional.of(new Table(QualifiedName.of("table1"))), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.of(new FetchFirst("2"))), Optional.empty(), Optional.empty(), Optional.empty()));
    assertStatement("SELECT * FROM table1 FETCH NEXT ROW ONLY", new Query(Optional.empty(), new QuerySpecification(selectList(new AllColumns()), Optional.of(new Table(QualifiedName.of("table1"))), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.of(new FetchFirst(Optional.empty()))), Optional.empty(), Optional.empty(), Optional.empty()));
    Query valuesQuery = query(values(row(new LongLiteral("1"), new StringLiteral("1")), row(new LongLiteral("2"), new StringLiteral("2"))));
    assertStatement("SELECT * FROM (VALUES (1, '1'), (2, '2')) FETCH FIRST ROW ONLY", simpleQuery(selectList(new AllColumns()), subquery(valuesQuery), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.of(new FetchFirst(Optional.empty()))));
    assertStatement("SELECT * FROM (VALUES (1, '1'), (2, '2')) FETCH FIRST ROW WITH TIES", simpleQuery(selectList(new AllColumns()), subquery(valuesQuery), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.of(new FetchFirst(Optional.empty(), true))));
    assertStatement("SELECT * FROM table1 FETCH FIRST 2 ROWS WITH TIES", new Query(Optional.empty(), new QuerySpecification(selectList(new AllColumns()), Optional.of(new Table(QualifiedName.of("table1"))), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.of(new FetchFirst("2", true))), Optional.empty(), Optional.empty(), Optional.empty()));
    assertStatement("SELECT * FROM table1 FETCH NEXT ROW WITH TIES", new Query(Optional.empty(), new QuerySpecification(selectList(new AllColumns()), Optional.of(new Table(QualifiedName.of("table1"))), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.of(new FetchFirst(Optional.empty(), true))), Optional.empty(), Optional.empty(), Optional.empty()));
}