presto-parser/src/main/java/io/prestosql/sql/parser/AstBuilder.java/AstBuilder/visitShowTables
class AstBuilder:    @Override
    public Node visitShowTables(SqlBaseParser.ShowTablesContext context)
    {
        return new ShowTables(
                getLocation(context),
                Optional.ofNullable(context.qualifiedName())
                        .map(this::getQualifiedName),
                getTextIfPresent(context.pattern)
                        .map(AstBuilder::unquote),
                getTextIfPresent(context.escape)
                        .map(AstBuilder::unquote));
    }