1 files changed, 162 insertions, 0 deletions
diff --git a/contrib/btree_gist/btree_int2.c b/contrib/btree_gist/btree_int2.c
new file mode 100644
index 00000000000..69393aee82e
--- /dev/null
+++ b/contrib/btree_gist/btree_int2.c
@@ -0,0 +1,162 @@
+#include "btree_gist.h"
+#include "btree_utils_num.h"
+
+typedef struct int16key
+{
+   int16    lower;
+   int16    upper;
+}  int16KEY;
+
+/*
+** int16 ops
+*/
+PG_FUNCTION_INFO_V1(gbt_int2_compress);
+PG_FUNCTION_INFO_V1(gbt_int2_union);
+PG_FUNCTION_INFO_V1(gbt_int2_picksplit);
+PG_FUNCTION_INFO_V1(gbt_int2_consistent);
+PG_FUNCTION_INFO_V1(gbt_int2_penalty);
+PG_FUNCTION_INFO_V1(gbt_int2_same);
+
+Datum    gbt_int2_compress(PG_FUNCTION_ARGS);
+Datum    gbt_int2_union(PG_FUNCTION_ARGS);
+Datum    gbt_int2_picksplit(PG_FUNCTION_ARGS);
+Datum    gbt_int2_consistent(PG_FUNCTION_ARGS);
+Datum    gbt_int2_penalty(PG_FUNCTION_ARGS);
+Datum    gbt_int2_same(PG_FUNCTION_ARGS);
+
+static bool     gbt_int2gt     (const void *a, const void *b)
+{
+  return ( *((int16*)a) >  *((int16*)b) ); 
+}
+static bool     gbt_int2ge     (const void *a, const void *b)
+{
+  return ( *((int16*)a) >= *((int16*)b) ); 
+}
+static bool     gbt_int2eq     (const void *a, const void *b)
+{
+  return ( *((int16*)a) == *((int16*)b) ); 
+}
+static bool     gbt_int2le     (const void *a, const void *b)
+{
+  return ( *((int16*)a) <= *((int16*)b) ); 
+}
+static bool     gbt_int2lt     (const void *a, const void *b)
+{
+  return ( *((int16*)a) <  *((int16*)b) ); 
+}
+
+static int
+gbt_int2key_cmp(const void *a, const void *b)
+{
+
+  if ( *(int16*)(&((Nsrt *) a)->t[0]) >  *(int16*)&(((Nsrt *) b)->t[0]) ){
+    return 1;
+  } else
+  if ( *(int16*)&(((Nsrt *) a)->t[0]) <  *(int16*)&(((Nsrt *) b)->t[0]) ){
+    return -1;
+  }
+  return  0;
+
+}
+
+
+static const gbtree_ninfo tinfo = 
+{ 
+  gbt_t_int2,
+  sizeof(int16),
+  gbt_int2gt,
+  gbt_int2ge,
+  gbt_int2eq,
+  gbt_int2le,
+  gbt_int2lt,
+  gbt_int2key_cmp
+};
+
+
+
+
+
+
+/**************************************************
+ * int16 ops
+ **************************************************/
+
+
+Datum
+gbt_int2_compress(PG_FUNCTION_ARGS)
+{
+    GISTENTRY  *entry  = (GISTENTRY *) PG_GETARG_POINTER(0);
+    GISTENTRY  *retval = NULL;
+    PG_RETURN_POINTER( gbt_num_compress( retval , entry , &tinfo ));
+}
+
+
+Datum
+gbt_int2_consistent(PG_FUNCTION_ARGS)
+{
+    GISTENTRY        *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+    int16             query = PG_GETARG_INT16(1);
+    int16KEY           *kkk = (int16KEY *) DatumGetPointer(entry->key);
+    GBT_NUMKEY_R        key ;
+    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
+    key.lower = (GBT_NUMKEY*) &kkk->lower ;
+    key.upper = (GBT_NUMKEY*) &kkk->upper ;
+
+    PG_RETURN_BOOL( 
+      gbt_num_consistent( &key, (void*)&query,&strategy,GIST_LEAF(entry),&tinfo)
+    );
+}
+
+
+Datum
+gbt_int2_union(PG_FUNCTION_ARGS)
+{
+    GistEntryVector     *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
+    void                     *out = palloc(sizeof(int16KEY));
+    *(int *) PG_GETARG_POINTER(1) = sizeof(int16KEY);
+    PG_RETURN_POINTER( gbt_num_union ( (void*)out, entryvec, &tinfo ) );
+}
+
+
+Datum
+gbt_int2_penalty(PG_FUNCTION_ARGS)
+{
+  int16KEY    *origentry = (int16KEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
+  int16KEY    *newentry  = (int16KEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
+  float          *result = (float *) PG_GETARG_POINTER(2);
+  int2              res  ;
+
+  *result = 0.0;
+
+  res     = Max(newentry->upper - origentry->upper, 0) +
+            Max(origentry->lower - newentry->lower, 0);
+
+  if ( res > 0 ){
+    *result += FLT_MIN ;
+    *result += (float) ( res / ( (double) ( res + origentry->upper - origentry->lower ) ) );
+    *result *= ( FLT_MAX / ( ( (GISTENTRY *) PG_GETARG_POINTER(0))->rel->rd_att->natts + 1 ) );
+  }
+
+  PG_RETURN_POINTER(result);
+}
+
+Datum
+gbt_int2_picksplit(PG_FUNCTION_ARGS)
+{
+  PG_RETURN_POINTER(gbt_num_picksplit(
+      (GistEntryVector *) PG_GETARG_POINTER(0),
+      (GIST_SPLITVEC *) PG_GETARG_POINTER(1),
+      &tinfo
+  ));
+}
+
+Datum
+gbt_int2_same(PG_FUNCTION_ARGS)
+{
+  int16KEY    *b1 = (int16KEY *) PG_GETARG_POINTER(0);
+  int16KEY    *b2 = (int16KEY *) PG_GETARG_POINTER(1);
+  bool     *result = (bool *) PG_GETARG_POINTER(2);
+
+  *result  = gbt_num_same ( (void*)b1, (void*)b2, &tinfo );
+  PG_RETURN_POINTER(result);
+}