Fixes some typos as found by codespell run on the code.
In this commit, I was hoping to fix only comments, not user-visible alerts, output, etc.
Follow-up commits will take care of them.
Refs: https://github.com/scylladb/scylladb/issues/16255
Signed-off-by: Yaniv Kaul <yaniv.kaul@scylladb.com>
data
We'll try to distinguish the case when data comes from the storage rather
than user reuqest. Such attribute can be used in expressions and
when it can't be decoded it should make expression evaluate as
false to simply exclude the row during filter query or scan.
Note that this change focuses on binary type, for other types we
may have some inconsistencies in the implementation.
Instead of lengthy blurbs, switch to single-line, machine-readable
standardized (https://spdx.dev) license identifiers. The Linux kernel
switched long ago, so there is strong precedent.
Three cases are handled: AGPL-only, Apache-only, and dual licensed.
For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0),
reasoning that our changes are extensive enough to apply our license.
The changes we applied mechanically with a script, except to
licenses/README.md.
Closes#9937
base64.hh pulls in the huge rjson.hh, so if someone just wants
a base64 codec they have to pull in the entire rapidjson library.
Move the json related parts of base64.hh to rjson.hh and adjust
includes and namespaces.
In practice it doesn't make much difference, as all users of base64
appear to want json too. But it's cleaner not to mix the two.
Closes#9433
The base64 encoding/decoding functions will be used for serialization of
hint sync point descriptions. Base64 format is not specific to
Alternator, so it can be moved to utils.
In issue #5021 we noted that Alternator's equality operator needs to be
fixed for the case of comparing two sets, because the equality check needs
to take into account the possibility of different element order.
Unfortunately, we fixed only the equality check operator, but forgot there
is also an inequality operator!
So in this patch we fix the inequality operator, and also add a test for
it that was previously missing.
The implementation of the inequality operator is trivial - it's just the
negation of the equality test. Our pre-existing tests verify that this is
the correct implementation (e.g., if attribute x doesn't exist, then "x = 3"
is false but "x <> 3" is true).
Refs #5021Fixes#8513
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20210419141450.464968-1-nyh@scylladb.com>
In issue #5021 we noticed that the equality check in Alternator's condition
expressions needs to handle sets differently - we need to compare the set's
elements ignoring their order. But the implementation we added to fix that
issue was only correct when the entire attribute was a set... In the
general case, an attribute can be a nested document, with only some
inner set. The equality-checking function needs to tranverse this nested
document, and compare the sets inside it as appropriate. This is what
we do in this patch.
This patch also adds a new test comparing equality of a nested document with
some inner sets. This test passes on DynamoDB, failed on Alternator before
this patch, and passes with this patch.
Refs #5021Fixes#8514
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20210419184840.471858-1-nyh@scylladb.com>
When a condition expression (ConditionExpression, FilterExpression, etc.)
checks for equality of two item attributes, i.e., "x = y", and when one of
these attributes was missing we correctly returned false.
However, we also need to return false when *both* attributes are missing in
the item, because this is what DynamoDB does in this case. In other words
an unset attribute is never equal to anything - not even to another unset
attribute. This was not happening before this patch:
When x and y were both missing attributes, Alternator incorrectly returned
true for "x = y", and this patch fixes this case. It also fixes "x <> y"
which should to be true when both x and y are unset (but was false
before this patch).
The other comparison operators - <, <=, >, >=, BETWEEN, were all
implemented correctly even before this patch.
This patch also includes tests for all the two-unset-attribute cases of
all the operators listed above. As usual, we check that these tests pass
on both DynamoDB and Alternator to confirm our new behavior is the correct
one - before this patch, two of the new tests failed on Alternator and
passed on DynamoDB.
Fixes#8511
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20210419123911.462579-1-nyh@scylladb.com>
The first condition expressions we implemented in Alternator were the old
"Expected" syntax of conditional updates. That implementation had some
specific assumptions on how it handles errors: For example, in the "LT"
operator in "Expected", the second operand is always part of the query, so
an error in it (e.g., an unsupported type) resulted it a ValidationException
error.
When we implemented ConditionExpression and FilterExpression, we wrongly
used the same functions check_compare(), check_BETWEEN(), etc., to implement
them. This results in some inaccurate error handling. The worst example is
what happens when you use a FilterExpression with an expression such as
"x < y" - this filter is supposed to silently skip items whose "x" and "y"
attributes have unsupported or different types, but in our implementation
a bad type (e.g., a list) for y resulted in a ValidationException which
aborted the entire scan! Interestingly, in once case (that of BEGINS_WITH)
we actually noticed the slightly different behavior needed and implemented
the same operator twice - with ugly code duplication. But in other operators
we missed this problem completely.
This patch first adds extensive tests of how the different expressions
(Expected, QueryFilter, FilterExpression, ConditionExpression) and the
different operators handle various input errors - unsupported types,
missing items, incompatible types, etc. Importantly, the tests demonstrate
that there is often different behavior depending on whether the bad
input comes from the query, or from the item. Some of the new tests
fail before this patch, but others pass and were useful to verify that
the patch doesn't break anything that already worked correctly previously.
As usual, all the tests pass on Cassandra.
Finally, this patch *fixes* all these problems. The comparison functions
like check_compare() and check_BETWEEN() now not only take the operands,
they also take booleans saying if each of the operands came from the
query or from an item. The old-syntax caller (Expected or QueryFilter)
always say that the first operand is from the item and the second is
from the query - but in the new-syntax caller (ConditionExpression or
FilterExpression) any or all of the operands can come from the query
and need verification.
The old duplicated code for check_BEGINS_WITH() - which a TODO to remove
it - is finally removed. Instead we use the same idea of passing booleans
saying if each of its operands came from an item or from the query.
Fixes#8043
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
C++20 introduced `contains` member functions for maps and sets for
checking whether an element is present in the collection. Previously
`count` function was often used in various ways.
`contains` does not only express the intend of the code better but also
does it in more unified way.
This commit replaces all the occurences of the `count` with the
`contains`.
Tests: unit(dev)
Signed-off-by: Piotr Jastrzebski <piotr@scylladb.com>
Message-Id: <b4ef3b4bc24f49abe04a2aba0ddd946009c9fcb2.1597314640.git.piotr@scylladb.com>
All the places in conditions.cc, expressions.cc and serialization.cc where
we constructed an api_error, we always used the ValidationException type
string, which the code repeated dozens of times.
This patch converts all these places to use the factory function
api_error::validation().
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
The "NULL" operator in Expected (old-style conditional operations) doesn't
have any parameters, so we insisted that the AttributeValueList be empty.
However, we forgot to allow it to also be missing - a possibility which
DynamoDB allows.
This patch adds a test to reproduce this case (the test passes on DyanmoDB,
fails on Alternator before this patch, and succeeds after this patch), and
a fix.
Fixes#6816.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20200709161254.618755-1-nyh@scylladb.com>
The source file alternator/executor.cc has grown too much, reaching almost
4,000 lines. In this patch I move about 400 lines out of executor.cc:
1. Some functions related to serialization of sets and lists were moved to
serialization.cc,
2. Functions related to evaluating parsed expressions were moved to
expressions.cc.
The header file expressions_eval.hh was also removed - the calculate_value()
functions now live in expressions.cc, so we can just define them in
expressions.hh, no need for a separate header files.
This patch just moves code around. It doesn't make any functional changes.
Refs #5783.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
It turns out that the contains() functions in the new syntax of
conditions (ConditionExpression, FilterExpression) is not identical
to the CONTAINS operator in the old-syntax conditions (Expected).
In the new syntax, one can check whether *any* constant object is contained
in a list. In the old syntax, the constant object must be of specific
types.
So we need to move the testing out of the check_CONTAINS() functions
that both implementations used, and into just the implementation of
the old syntax (in conditions.cc).
This bug broke one of the FilterExpression tests, but this patch also
adds new tests for the different behaviour of ConditionExpression and
Expected - tests which also reproduce this issue and verify its fix.
Fixes#6639.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
In the DynamoDB API, expressions (e.g., ConditionExpression and many more)
may contain references to column names ("#name") or to values (":val")
given in a separate part of the request - ExpressionAttributeNames and
ExpressionAttributeValues respectively.
Before this patch, we resolved these references as part of the expression's
evaluation. This approach had two downsides:
1. It often misdiagnosed (both false negatives and false positives) cases
of unused names and values in expressions. We already had two xfailing
tests with examples - which pass after this patch. This patch also
adds two additional tests, which failed before this patch and pass
with it.
2. In one of the following patches we will add support for FilterExpression,
where the same expression is used repeatedly on many items. It is a waste
(as well as makes the code uglier) to resolve the same references again
and again each time the expression is evaluated. We should be able
to do it just once.
So this patch introduces an intermediate step between parsing and evaluating
an expression - "resolving" the expression. The new resolve_*() functions
modify the already parsed expression, replacing references to attribute
names and constant values by the actual names and values taken from the
request. The resolve_*() functions also keep track which references were
used, making it very easy to check (as DynamoDB does) if there are any
unused names or values, before starting the evaluation.
The interface of evaluate() functions become much simpler - they no longer
need to know the original request (which was previously needed for
ExpressionAttributeNames/Values), the table's schema (which was previously
needed only for some error checking), keep track of which references were
used. This simplification is helpful for using the expressions in contexts
where these things (request and schema) are no longer conveniently available,
namely in FilterExpression.
A small side-benefit of this patch is that it moves a bit of code, which
handled resolving of references in expressions, from executor.cc to
expressions.cc. This is just the first step in a bigger effort to
reduce the size of executor.cc by moving code to smaller source files.
There is no attempt in this patch to move as much code as we can.
We will move more code in a separate patch in this series.
Fixes#6572.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
In the existing Alternator code, we used std::unique_ptr<rjson::value> for
passing the optional old value of an item read for a RMW operation.
The benfit of this type over the simpler "const rjson::value*" is that it
gives the callee ownership of the item, and thus the ability to move parts
of it into the response without copying them. We only used this ability in a
handful of obscure cases involving ReturnedValues, but I am not going to
break this dubious feature in this patch.
Nevertheless, a lot of internal code, like condition checks, just needs
read-only access to that previous item, so we passed a reference to the
unique_ptr, i.e., "const std::unique_ptr<rjson::value>&". This is ugly,
and also forces new code that wants to use the same condition checks (i.e.,
filtering code), to artificially allocate a unique_ptr just because that
is what these functions expect.
So in this patch, we change the utility functions such as
verify_condition_expression() and everything they use, to pass around a
"const rjson::value*" instead of a "const std::unique_ptr<rjson::value>&.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20200604131352.436506-1-nyh@scylladb.com>
The DynamoDB GetItem request returns the requested item in a specific way,
wrapped in a map with a "Item" member. For historic reasons, we used the
same function that returns this (describe_item()) also in other code which
reads items - e.g. for checking conditional operations. The result is
wasteful - after adding this "Item" member we had other code to extract it,
all for no good reason. It is also ugly and confusing.
Importantly, this situation also makes it harder for me to add support for
FilterExpression. The issue is that the expression evaluator got the item
with the wrapper (from the existing ConditionExpression code) but the
filtering code had it without this wrapper, as it didn't use describe_item().
So this patch uses describe_single_item(), which doesn't add the wrapper
map, instead of describe_item(). The latter function is used just once -
to implement GetItem. The unnecessary code to unwrap the item in multiple
places was then dropped.
All the tests still pass. I also tested test_expected.py in unsafe_rmw write
isolation mode, because code only for this mode had to be modified as well.
Refs #5038.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20200604092050.422092-1-nyh@scylladb.com>
This patch implements the missing QueryFilter (and ScanFilter)
functionality:`
1. All operators. Previously, only the "EQ" operator was implemented.
2. Either "OR" or "AND" of conditions (previously only "AND").
3. Correctly returning Count and ScannedCount for post-filter and
pre-filter item counts, respectively.
All of the previously-xfailing tests in test_query_filter.py are now
passing.
The implementation in this patch abandons our previous attempts to
translate the DynamoDB API filters into Scylla's CQL filters.
Doing this correctly for all operators would have been exceedingly
difficult (for reasons explained in #5028), and simply not worth the
effort: CQL's filters receive a page of results and then filter them,
and we can do exactly the same without CQL's filters:
The new code just retrieves an unfiltered page of items, and then for
each of these items checks whether it passes the filters. The great thing
is that we already had code for this checking - the QueryFilter syntax is
identical to the "Expected" syntax (for conditional operations) that
we already supported, so we already had code for checking these conditions,
including all the different operators.
This patch prepares for the future need to support also the newer
FilterExpression syntax (see issue #5038), and the "filter" class
supports either type of filter - the implementation for the second
syntax is just missing and can be added (fairly easily) later.
Fixes#5028.
Refs #5038.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20200603110118.399325-1-nyh@scylladb.com>
We implemented the order operators (LT, GT, LE, GE, BETWEEN) incorrectly
for binary attributes: DynamoDB requires that the bytes be treated as
unsigned for the purpose of order (so byte 128 is higher than 127), but
our implementation uses Scylla's "bytes" type which has signed bytes.
The solution is simple - we can continue to use the "bytes" type, but
we need to use its compare_unsigned() function, not its "<" operator.
This bug affected conditional operations ("Expected" and
"ConditionExpression") and also filters ("QueryFilter", "ScanFilter",
"FilterExpression"). The bug did *not* affect Query's key conditions
("KeyConditions", "KeyConditionExpression") because those already
used Scylla's key comparison functions - which correctly compare binary
blobs as unsigned bytes (in fact, this is why we have the
compare_unsigned() function).
The patch also adds tests that reproduce the bugs in conditional
operations, and show that the bug did not exist in key conditions.
Fixes#6573
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20200603084257.394136-1-nyh@scylladb.com>
The ScanFilter and QueryFilter features are only partially implemented.
Most of their unimplemented features cause clear errors telling the user
of the unimplemented feature, but one exception is the ConditionalOperator
parameter, which can be used to "OR", instead of the default "AND", of
several conditions. Before this patch, we simply ignored this parameter -
causing wrong results to be returned instead of an error.
In this patch, ScanFilter and QueryFilter parse, instead of ignoring, the
ConditionalOperator. The common implementation, get_filtering_restrictions(),
still does not implement the OR case, but returns an error if we reach
this case instead of just ignoring it.
There is no new test. The existing test_query_filter.py::test_query_filter_or
xfailed before this patch, and continues to xfail after it, but the failure
is different (you can see it by running the test with "--runxfail"):
Before this patch, the failure was because of different results. After this
patch, the failure is because of an "unimplemented" error message.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20200528214721.230587-2-nyh@scylladb.com>
The code for parsing the ConditionalOperator attribute was used once in
for the "Expected" case, but we will also need it for the "QueryFilter" and
"ScanFilter" cases, so let's extract it into a function,
get_conditional_operator().
While doing this extraction, I also noticed a bug: when Expected is missing,
ConditionalOperator should not be allowed. We correctly checked the case
of an empty Expected, but forgot to also check the case of a missing
Expected. So the new code also fixes this corner case, and we include
a new test case for it (which passes on DynamoDB and used to fail in
Alternator but passes after this patch).
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20200528214721.230587-1-nyh@scylladb.com>
We had to wait many years for it, but finally we have a starts_with()
method in C++20. Let's use it instead of ugly substr()-based code.
This is probably not a performance gain - substr() for a string_view
was already efficient. But it makes the code easier to understand,
and it allows us to rejoice in our decision to switch to C++20.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20200526185812.165038-2-nyh@scylladb.com>
In commit cb7d3c6b55 we started to check
if two base64-encoded strings begin with each other without decoding
the strings first.
However, we missed the check_BEGINS_WITH function which does the same
thing. So this patch fixes this function as well.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20200526185812.165038-1-nyh@scylladb.com>
Our rjson::find() convenience function used RapidJson's "StringRef" type,
which is almost exactly like std::string_view. If we switch to use
string_view as we do in this patch, a lot of call sites become much simpler.
Moreover, there was an even more important motivation for this patch:
the RapidJson FindMember() function we used in rjson::find() has a bug when
given a StringRef - although a StringRef contains a length, the FindMember()
code ignores it and expects the string to be null-terminated (see:
https://github.com/Tencent/rapidjson/issues/1649). In this patch, we wrap
the pointer and length of a std::string_view in an rjson::value, a code path
which bypasses the FindMember bug, and yet does not require copying the
string.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20200303141814.26929-1-nyh@scylladb.com>
We had a get_key_from_typed_value() utility function to decode a
JSON-encoded value with a known type (the JSON encoding is a map whose
key is the type, the value always a string because all possible key types -
string, bytes and number, are encoded as strings).
However, the function was less useful than it could have been - it was
missing one check for a malformed object (a check which only appeared in
one of its callers), it unnecessarily received the column's expected type
(all the callers passed it the given key column's type).
The cleaned up function will be more useful for the following patch
to support KeyConditionExpression, which wants to reuse it.
While at it, this patch also uses rjson::to_string_view(it->value)
instead of the less correct it->value.GetString() (the latter relies
on null-termination, which is actually true for JSON strings, but there
is no reason to rely on it).
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20200213192509.32685-3-nyh@scylladb.com>
conditions.cc contains a useful utility function for extracting (without
copying) a string_view from a rjson::value which is known to contain a
string. This function will be useful in more Alternator code, so let's
extract it to rjson.hh, with the name rjson::to_string_view()
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20200213192509.32685-2-nyh@scylladb.com>
This patch adds support for the ConditionExpression parameter of the
item-writing operations in Alternator: PutItem, UpdateItem and DeleteItem.
We already supported conditional updates/put/delete using the "Expected"
parameter. The ConditionExpression parameter implemented here provides a
very similar feature, using a different - and also newer and more powerful -
syntax.
The implementation here reuses much of our existing expression-parsing
infrastructure. Unsurprisingly, ConditionExpression's syntax has much in
common with UpdateExpression which we already support) and also many of the
comparison functions already implemented for "Expected". However, it's still
quite a bit of new code, because of the many different comparisons, functions,
and syntax variations we need to support.
This patch also expands alternator-test/test_condition_expression.py with
a few additional corner cases discovered during the development of this
patch.
Almost all of the tests for this feature (35 out of 39) now pass.
Two tests still fail because we don't yet support nested attributes (this
is a missing feature across Alternator), and two tests fail because of minor
ideosyncracies in DynamoDB's error path that we chose not to duplicate
yet (but still remember the difference in the form of an xfailing test).
Fixes#5035
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
In this patch, we re-implement the three read-modify-write operations -
PutItem, UpdateItem, DeleteItem. All three operations may need to read the
item before writing it to support conditional updates (the "Expected"
parameter) and UpdateItem may also need the previous item's value for
its update expression (e.g., a user may ask to "set a=a+1" or "set a=b").
Before this patch, the implementation of RMW operations simply did a read,
and then a write - without any attempt to protect concurrent operations.
In this patch, Scylla's LWT mechanism (storage_proxy::cas()) is used
instead, to ensure that concurrent update operations are correctly
isolated even if they are conditional. This means that Alternator now
requires the experimental LWT feature to be enabled (and refuses to
boot if it isn't).
The version presented here is configured to always use LWT for *every*
write, regardless of whether it has a condition or not. So it will
will significantly slow down write-only workloads like YCSB. But the code
in this patch actually includes three other modes, which can be chosen by
setting an enum constant in the code. In the future we will want to let the
user configure this mode, globally, per table or per attribute.
Note that read requests are NOT modified, and work exactly as they did
before: i.e., strongly-consistent reads are done using a normal
CL=LOCAL_QUORUM read - not via LWT. I believe this is good enough given
Dynamo's guarantees, and critical for our read performance.
Also note that patch doesn't yet fix the BatchWriteItem operation.
Although BatchWriteItem does not support any RMW operations - just pure
writes - we may still need to do those pure writes using LWT. This
should be fixed in a follow-up patch.
Unfortunately, this patch involves a large amount of code movement and
reorganization, because:
1. The cas operation requires each operation to be made into an object,
with a separate apply() function, forcing a lot of code to move.
2. Moreover, we need to do this for three different operations (PutItem,
UpdateItem, DeleteItem) so to avoid massive code duplication, I had
to move some common code.
3. The cas operation also forced us to change some of the utility functions'
APIs.
The end result is that this patch focuses more on a compact and
understandable *end result* than it does on an easy to understand *patch*,
so reviewers - sorry about that.
All alternator-test/ tests pass with this patch (and also with all of the
different optional modes enabled). However, other than that, I did not yet
do any real isolation tests (are concurrent operations really isolated
correctly? or is LWT just faking it? :-) ), performance tests or stress
tests - and I'll definitely need to do those as well.
Fixes#5054
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
The implementation of Expected's BEGINS_WITH operator on blobs was
incorrect, naively comparing the base64-encoded strings, which doesn't
work. This patches fixes the code to compare the decoded strings.
The reason why the BEGINS_WITH test missed this bug was that we forgot
to check the blob case and only tested the string case; So this patch
also adds the missing test - which reproduces this bug, and verifies
its fix.
Fixes#5457
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20191211115526.29862-1-nyh@scylladb.com>
Merged pull request https://github.com/scylladb/scylla/pull/5453
from Piotr Sarna:
Checking the EQ relation for alternator attributes is usually performed
simply by comparing underlying JSON objects, but sets (SS, BS, NS types)
need a special routine, as we need to make sure that sets stored in
a different order underneath are still equal, e.g:
[1, 3, 2] == [1, 2, 3]
Fixes#5021
Checking the EQ relation for alternator attributes is usually performed
simply by comparing underlying JSON objects, but sets (SS, BS, NS types)
need a special routine, as we need to make sure that sets stored in
a different order underneath are still equal, e.g:
[1, 3, 2] == [1, 2, 3]
Fixes#5021
Enable existing NOT_CONTAINS test, add NOT_CONTAINS to the list of
recognized operators, implement check_NOT_CONTAINS, and hook it up to
verify_expected_one().
Signed-off-by: Dejan Mircevski <dejan@scylladb.com>
All check_compare diagnostics are static strings, so there's no need
to call functions to get them. Instead of a function, make diagnostic
a simple value.
Signed-off-by: Dejan Mircevski <dejan@scylladb.com>
Code for check_LT(), check_GT(), etc. will be nearly identical, so
factor it out into a single function that takes a comparator object.
Signed-off-by: Dejan Mircevski <dejan@scylladb.com>
The BEGINS_WITH condition in conditional updates (via Expected) requires
that the given operand be either a string or a binary. Any other operand
should result in a validation exception - not a failed condition as we
generate now.
This patch fixes the test for this case so it will succeed against
Amazon DynamoDB (before this patch it fails - this failure was masked by
a typo before commit 332ffa77ea). The patch
then fixes our code to handle this case correctly.
Note that BEGINS_WITH handling of wrong types is now asymmetrical: A bad
type in the operand is now handled differently from a bad type in the
attribute's value. We add another check to the test to verify that this
is the case.
Fixes#5141
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20191006080553.4135-1-nyh@scylladb.com>
Put all AttributeValuelist size verification under
verify_operand_count(), rather than have some cases invoke
verify_operand_count() while others verify it in check_*() functions.
Signed-off-by: Dejan Mircevski <dejan@scylladb.com>
Add check_IN() and a switch case that invokes it. Reactivate IN
tests. Add a testcase for non-scalar attribute values.
Signed-off-by: Dejan Mircevski <dejan@scylladb.com>
