Horton

Re: TupleTableSlot abstraction

Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>

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From: Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>
To: Andres Freund <andres@anarazel.de>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>, Robert Haas <robertmhaas@gmail.com>, Haribabu Kommi <kommi.haribabu@gmail.com>, Alvaro Herrera <alvherre@2ndquadrant.com>, Amit Kapila <amit.kapila16@gmail.com>
Date: 2018-08-20T12:21:38Z
Lists: pgsql-hackers

Attachments

On Sat, Aug 18, 2018 at 8:53 PM, Andres Freund <andres@anarazel.de> wrote:
> On 2018-08-17 01:07:06 -0700, Andres Freund wrote:
>> Hi,
>>
>> On 2018-08-17 12:10:20 +0530, Ashutosh Bapat wrote:
>> > We need to add LLVM code to fetch tts_flags and
>> > perform bit operation on it to get or set slow property. I haven't
>> > found any precedence for LLVM bit operations in postgresql's JIT code.
>>
>> There are several, look for the infomask accesses in
>> slot_compiler_deform.
>>
>> I'll try to do the adaption later today.
>
> Attached is a series of patches doing so.  The previous implementation
> of sysvar accesses wasn't actually working - the slot argument was
> uninitialized.

Sorry for that. I couldn't test it since the code wasn't compiling.
The changes to slot_compile_deform changes you provided in the patch
fix the compilation errors. Thanks for those changes.

>
> I also noticed an independent issue in your changes to
> ExecInitScanTupleSlot(): You can't assume that the plan belonging to the
> ScanState have a Scan node in their plan. Look e.g. at Material, Sort
> etc. So currently your scanrelid access is often just uninitialized
> data.

I have incorporated changes in your patches into the relevant patches
in the updated patch-set. With this patch-set make check-world passes
for me.

-- 
Best Wishes,
Ashutosh Bapat
EnterpriseDB Corporation
The Postgres Database Company

Commits

  1. Fix memory leak when inserting tuple at relation creation for CTAS

  2. Build HashState's hashkeys expression with the correct parent.

  3. Move TupleTableSlots boolean member into one flag variable.

  4. Move generic slot support functions from heaptuple.c into execTuples.c.

  5. Remove absolete function TupleDescGetSlot().

  6. Remove function list from prologue of execTuples.c.

  7. Split ExecStoreTuple into ExecStoreHeapTuple and ExecStoreBufferHeapTuple.

  8. Change TupleTableSlot->tts_nvalid to type AttrNumber.

  9. Deduplicate code between slot_getallattrs() and slot_getsomeattrs().

  10. Mention ownership requirements for REFRESH MATERIALIZED VIEW in docs

  11. Spell "partitionwise" consistently.

  12. Fix WHERE CURRENT OF when the referenced cursor uses an index-only scan.