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sql: unexpected value when renaming table to an existing one #55985

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jayshrivastava opened this issue Oct 26, 2020 · 0 comments · Fixed by #55997
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sql: unexpected value when renaming table to an existing one #55985

jayshrivastava opened this issue Oct 26, 2020 · 0 comments · Fixed by #55997
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C-bug Code not up to spec/doc, specs & docs deemed correct. Solution expected to change code/behavior.

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jayshrivastava commented Oct 26, 2020 •
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This action produces an unexpected error.

root@:26257/defaultdb> create schema foo;
CREATE SCHEMA

root@:26257/defaultdb> create table foo.bar();
CREATE TABLE

root@:26257/defaultdb> create table foo.bar2();
CREATE TABLE

root@:26257/defaultdb> alter table foo.bar rename to foo.bar2;
ERROR: unexpected value: raw_bytes:"\300\341\032\005\001z" timestamp:<wall_time:1603733043407024000 >
@jayshrivastava jayshrivastava added the C-bug Code not up to spec/doc, specs & docs deemed correct. Solution expected to change code/behavior. label Oct 26, 2020
@jayshrivastava jayshrivastava self-assigned this Oct 26, 2020
@jayshrivastava jayshrivastava mentioned this issue Oct 26, 2020
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craig bot pushed a commit that referenced this issue Oct 27, 2020
@knz @sumeerbhola @jayshrivastava
Merge #55398 #55986 #55997
8652b7a 
55398:  *: make conversions between `string` and usernames more explicit  r=aaron-crl,arulajmani a=knz

Informs (but does not fix) #55396

Informs #54696
Informs  #55389

tldr: the conversions between "external" strings and internal
usernames was unprincipled, and it turns out, incorrect in some
cases. This patch cleans this up by introducing a strict conversion
API.

**Background**

CockroachDB currently performs case folding and unicode NFC
normalization upon receiving usernames, specifically usernames received
from as SQL login principals.

Internally, usernames are often—but not always—considered
pre-normalized for the purpose of comparisons, privilege checks, role
membership checks and the like.

Finally, sometimes usernames are reported "back to outside".
In error messages, log files etc, but also:

- in the SQL syntax produced by SHOW CREATE, SHOW SYNTAX etc.
- to generate OS-level file names for exported files.

**New API**

This patch introduces a new data type `security.SQLUsername`.
It is incomparable and non-convertible with the Go `string`.

Engineers must now declare intent about how to do the conversion:

- `security.MakeSQLUsernameFromUserInput` converts an "outside" string
  to a username.
- `security.MakeSQLUsernameFromPreNormalizedString` promises that
  its argument has already been previously normalized.
- `security.MakeSQLUsernameFromPreNormalizedStringChecked` also checks
  that its argument has already been previously normalized.

To output usernames, the following APIs are also available.

- `username.Normalized()` produces the username itself, without
  decorations. These corresponds to the raw string (after
  normalization).

- `username.SQLIdentifier()` produces the username in valid
  SQL syntax, so that it can be injected safely in a SQL
  statement.

- `(*tree.FmtCtx).FormatUsername()` takes a username and properly
  handles quoting and anonymization, like `FormatName()` does for
  `tree.Name` already.

Likewise, conversion from/to protobuf is now regulated, via the new
APIs `username.EncodeProto()` and `usernameproto.Decode()`.

**Problems being solved**

- the usernames "from outside" were normalized sometimes, *but not
  consistently*:

  1. they were in the arguments of CREATE/DROP/ALTER ROLE. This was
     not changed.
  2. they were not consistently converted in `cockroach cert`. This was
     corrected.
  3. they were not in the `cockroach userfile` commands. This
     has been adjusted with a reference to issue #55389.
  4. they are *not* in GRANT/REVOKE. This patch does not change
     this behavior, but highlights it by spelling out
     `MakeSQLUsernameFromPreNormalizedString()` in the implementation.
  5. ditto for CREATE SCHEMA ... AUTHORIZATION and ALTER ... OWNER TO
  6. they were in the argument to `LoginRequest`. This was not
     changed.
  7. they were not in the argument of the other API requests that
     allow usernames, for example `ListSessions` or `CancelQuery`.
     This was not changed, but is now documented in the API.

- the usernames "inside" were incorrectly directly injected
  in SQL statements, even though they may contain special
  characters that create SQL syntax errors.

  This has been corrected by suitable uses of the new
  `SQLIdentifier()` method.

- There was an outright bug in a call to `CreateGCJobRec` (something
  about GCing jobs), where a `Description` field was passed in lieu
  of a username for a `User` field. The implications of this are unclear.

**Status after this change**

The new API makes it possible to audit exactly where "sensitive"
username/string conversion occurs. After this patch, we find the
following uses:

- `MakeSQLUsernameFromUserInput`:

  - pgwire user auth
  - CLI URL parsing
  - `cockroach userfile`
  - `cockroach cert`
  - `(*rpc.SecurityContext).PGURL()` (unsure whether that's a good thing)
  - CREATE/DROP/ALTER ROLE
  - when using literal strings as `role_spec` in the SQL grammar

- `MakeSQLUsernameFromPreNormalizedString`:

  - role membership checks inside SQL based on data read
    from `system` tables.
  - in GRANT/REVOKE (this is surprising, see above)

- `MakeSQLUsernameFromPreNormalizedStringChecked`:

  - when intepreting the username in API query parameters, for
    those API documented as using pre-normalized usernames.

Release note: None

55986: opt: use paired joins for left semi inverted joins r=sumeerbhola a=sumeerbhola

Semi joins using the inverted index used to be converted
to an inner inverted join followed by an inner lookup join
and a distinct for de-duplication. They are now converted
to paired-joins consisting of an inner inverted join
followed by a left semi lookup join, which is more
efficient.

Release note: None

55997: sql: fix object lookup for ALTER TABLE ... RENAME TO ... r=ajwerner a=jayshrivastava

Previously, ALTER TABLE schema.table RENAME TO schema.existing_table
would fail because the statement would look up the destination table in
the public schema only. This commit fixes this behavior by using
the correct destination schema.

Fixes #55985

Release note: None


Co-authored-by: Raphael 'kena' Poss <knz@thaumogen.net>
Co-authored-by: sumeerbhola <sumeer@cockroachlabs.com>
Co-authored-by: Jayant Shrivastava <jayants@cockroachlabs.com>
@craig craig bot closed this as completed in 261f3a6 Oct 27, 2020
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sql: fix object lookup for ALTER TABLE ... RENAME TO ... jayshrivastava/cockroach
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