Examples with Identifier io.trino.sql.tree.Identifier used on opensource projects

Example 71 with Identifier

use of io.trino.sql.tree.Identifier in project trino by trinodb.

the class QueryRewriter method checksumSql.

private String checksumSql(List<Column> columns, QualifiedName table) throws QueryRewriteException {
    if (columns.isEmpty()) {
        throw new QueryRewriteException("Table " + table + " has no columns");
    }
    ImmutableList.Builder<SelectItem> selectItems = ImmutableList.builder();
    for (Column column : columns) {
        Expression expression = new Identifier(column.getName());
        if (column.isApproximateType()) {
            expression = new FunctionCall(QualifiedName.of("round"), ImmutableList.of(expression, new LongLiteral(Integer.toString(doublePrecision))));
        }
        selectItems.add(new SingleColumn(new FunctionCall(QualifiedName.of("checksum"), ImmutableList.of(expression))));
    }
    Select select = new Select(false, selectItems.build());
    return formatSql(new QuerySpecification(select, Optional.of(new Table(table)), Optional.empty(), Optional.empty(), Optional.empty(), ImmutableList.of(), Optional.empty(), Optional.empty(), Optional.empty()));
}