Re: crash with sql language partition support function

I think this is a good improvement. On top of that, I propose a new
file partitioning/partdefs.h with the following approximate contents.
This reduces cross-inclusion of headers to the minimum. I'm dealing
with the fallout from this now, will post a complete patch shortly.

/*-------------------------------------------------------------------------
*
* partdefs.h
* Base definitions for partitioned table handling
*
* Copyright (c) 2007-2018, PostgreSQL Global Development Group
*
* src/include/partitioning/partdefs.h
*
*-------------------------------------------------------------------------
*/
#ifndef PARTDEFS_H
#define PARTDEFS_H

typedef enum PartitionRangeDatumKind
{
PARTITION_RANGE_DATUM_MINVALUE = -1, /* less than any other value */
PARTITION_RANGE_DATUM_VALUE = 0, /* a specific (bounded) value */
PARTITION_RANGE_DATUM_MAXVALUE = 1 /* greater than any other value */
} PartitionRangeDatumKind;

typedef struct PartitionBoundInfoData *PartitionBoundInfo;

typedef struct PartitionKeyData *PartitionKey;

typedef struct PartitionBoundSpec PartitionBoundSpec;

typedef struct PartitionDescData *PartitionDesc;

#endif /* PARTDEFS_H */

--
Álvaro Herrera https://www.2ndQuadrant.com/
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