Make RUM work on 10devel

PostgreSQL 10devel was feature freezed.  Thus, we should start thinking about
providing RUM for it.  This commit adopts RUM to API changes yet introduced
in 10devel.  Macros are used to provide build on both 9.6 and 10.

Author: Alexander Korotkov

Diff for: src/rum.h

@@ -427,7 +427,11 @@ extern IndexBuildResult *rumbuild(Relation heap, Relation index,
 extern void rumbuildempty(Relation index);
 extern bool ruminsert(Relation index, Datum *values, bool *isnull,
 		  ItemPointer ht_ctid, Relation heapRel,
-		  IndexUniqueCheck checkUnique);
+		  IndexUniqueCheck checkUnique
+#if PG_VERSION_NUM >= 100000
+		  , struct IndexInfo *indexInfo
+#endif
+		  );
 extern void rumEntryInsert(RumState * rumstate,
 			   OffsetNumber attnum, Datum key, RumNullCategory category,
 			   RumKey * items, uint32 nitem, GinStatsData *buildStats);

Diff for: src/rum_ts_utils.c

@@ -26,6 +26,11 @@
 
 #include <math.h>
 
+/* Use TS_EXEC_PHRASE_AS_AND when TS_EXEC_PHRASE_NO_POS is not defined */
+#ifndef TS_EXEC_PHRASE_NO_POS
+#define TS_EXEC_PHRASE_NO_POS TS_EXEC_PHRASE_AS_AND
+#endif
+
 PG_FUNCTION_INFO_V1(rum_extract_tsvector);
 PG_FUNCTION_INFO_V1(rum_extract_tsvector_hash);
 PG_FUNCTION_INFO_V1(rum_extract_tsquery);
@@ -177,7 +182,7 @@ rum_tsquery_pre_consistent(PG_FUNCTION_ARGS)
 
 		res = TS_execute(GETQUERY(query),
 						 &gcv,
-						 TS_EXEC_PHRASE_AS_AND,
+						 TS_EXEC_PHRASE_NO_POS,
 						 pre_checkcondition_rum);
 	}
 
@@ -326,7 +331,7 @@ rum_tsquery_timestamp_consistent(PG_FUNCTION_ARGS)
 		gcv.recheckPhrase = true;
 
 		res = TS_execute(GETQUERY(query), &gcv,
-						 TS_EXEC_CALC_NOT | TS_EXEC_PHRASE_AS_AND,
+						 TS_EXEC_CALC_NOT | TS_EXEC_PHRASE_NO_POS,
 						 checkcondition_rum);
 	}
 

Diff for: src/ruminsert.c

@@ -788,7 +788,11 @@ rumHeapTupleInsert(RumState * rumstate, OffsetNumber attnum,
 bool
 ruminsert(Relation index, Datum *values, bool *isnull,
 		  ItemPointer ht_ctid, Relation heapRel,
-		  IndexUniqueCheck checkUnique)
+		  IndexUniqueCheck checkUnique
+#if PG_VERSION_NUM >= 100000
+		  , struct IndexInfo *indexInfo
+#endif
+		  )
 {
 	RumState	rumstate;
 	MemoryContext oldCtx;

Diff for: src/rumsort.c

@@ -154,6 +154,11 @@ bool		trace_sort = false;
 bool		optimize_bounded_sort = true;
 #endif
 
+#if PG_VERSION_NUM < 100000
+/* Provide fallback for old version of tape interface for 9.6 */
+#define LogicalTapeRewindForRead(x, y, z) LogicalTapeRewind((x), (y), false)
+#define LogicalTapeRewindForWrite(x, y) LogicalTapeRewind((x), (y), true)
+#endif
 
 /*
  * The objects we actually sort are SortTuple structs.  These contain
@@ -300,6 +305,9 @@ struct Tuplesortstate
 	int			memtupsize;		/* allocated length of memtuples array */
 	bool		growmemtuples;	/* memtuples' growth still underway? */
 
+	/* Buffer size to use for reading input tapes, during merge. */
+	size_t		read_buffer_size;
+
 	/*
 	 * While building initial runs, this is the current output run number
 	 * (starting at 0).  Afterwards, it is the number of initial runs we made.
@@ -2364,6 +2372,8 @@ mergeruns(Tuplesortstate *state)
 				svTape,
 				svRuns,
 				svDummy;
+	int			numTapes;
+	int			numInputTapes;
 
 	Assert(state->status == TSS_BUILDRUNS);
 	Assert(state->memtupcount == 0);
@@ -2383,9 +2393,33 @@ mergeruns(Tuplesortstate *state)
 		return;
 	}
 
+	/*
+	 * If we had fewer runs than tapes, refund the memory that we imagined we
+	 * would need for the tape buffers of the unused tapes.
+	 *
+	 * numTapes and numInputTapes reflect the actual number of tapes we will
+	 * use.  Note that the output tape's tape number is maxTapes - 1, so the
+	 * tape numbers of the used tapes are not consecutive, and you cannot just
+	 * loop from 0 to numTapes to visit all used tapes!
+	 */
+	if (state->Level == 1)
+	{
+		numInputTapes = state->currentRun;
+		numTapes = numInputTapes + 1;
+		FREEMEM(state, (state->maxTapes - numTapes) * TAPE_BUFFER_OVERHEAD);
+	}
+	else
+	{
+		numInputTapes = state->tapeRange;
+		numTapes = state->maxTapes;
+	}
+
+	state->read_buffer_size = Max(state->availMem / numInputTapes, 0);
+	USEMEM(state, state->read_buffer_size * numInputTapes);
+
 	/* End of step D2: rewind all output tapes to prepare for merging */
 	for (tapenum = 0; tapenum < state->tapeRange; tapenum++)
-		LogicalTapeRewind(state->tapeset, tapenum, false);
+		LogicalTapeRewindForRead(state->tapeset, tapenum, state->read_buffer_size);
 
 	for (;;)
 	{
@@ -2448,11 +2482,10 @@ mergeruns(Tuplesortstate *state)
 		if (--state->Level == 0)
 			break;
 		/* rewind output tape T to use as new input */
-		LogicalTapeRewind(state->tapeset, state->tp_tapenum[state->tapeRange],
-						  false);
+		LogicalTapeRewindForRead(state->tapeset, state->tp_tapenum[state->tapeRange],
+								 state->read_buffer_size);
 		/* rewind used-up input tape P, and prepare it for write pass */
-		LogicalTapeRewind(state->tapeset, state->tp_tapenum[state->tapeRange - 1],
-						  true);
+		LogicalTapeRewindForWrite(state->tapeset, state->tp_tapenum[state->tapeRange - 1]);
 		state->tp_runs[state->tapeRange - 1] = 0;
 
 		/*
@@ -2818,9 +2851,9 @@ rum_tuplesort_rescan(Tuplesortstate *state)
 			state->markpos_eof = false;
 			break;
 		case TSS_SORTEDONTAPE:
-			LogicalTapeRewind(state->tapeset,
-							  state->result_tape,
-							  false);
+			LogicalTapeRewindForRead(state->tapeset,
+									 state->result_tape,
+									 state->read_buffer_size);
 			state->eof_reached = false;
 			state->markpos_block = 0L;
 			state->markpos_offset = 0;
@@ -2883,11 +2916,18 @@ rum_tuplesort_restorepos(Tuplesortstate *state)
 			state->eof_reached = state->markpos_eof;
 			break;
 		case TSS_SORTEDONTAPE:
+#if PG_VERSION_NUM < 100000
 			if (!LogicalTapeSeek(state->tapeset,
 								 state->result_tape,
 								 state->markpos_block,
 								 state->markpos_offset))
 				elog(ERROR, "rum_tuplesort_restorepos failed");
+#else
+			LogicalTapeSeek(state->tapeset,
+							state->result_tape,
+							state->markpos_block,
+							state->markpos_offset);
+#endif
 			state->eof_reached = state->markpos_eof;
 			break;
 		default:

Diff for: src/rumvalidate.c

@@ -21,6 +21,9 @@
 #include "catalog/pg_type.h"
 #include "utils/builtins.h"
 #include "utils/catcache.h"
+#if PG_VERSION_NUM >= 100000
+#include "utils/regproc.h"
+#endif
 #include "utils/syscache.h"
 
 #include "rum.h"