Start of experimental implementation of SQL window functions. Does not yet

work.

FossilOrigin-Name: 3781e520854808fe02ad3fe77dd11fc917448c58ff1fd79123289dd91937decd

1 files changed, 17 insertions, 0 deletions

diff --git a/src/vdbemem.c b/src/vdbemem.c
index d118d2bb9..a64ed0963 100644
--- a/src/vdbemem.c
+++ b/src/vdbemem.c
@@ -415,6 +415,23 @@ int sqlite3VdbeMemFinalize(Mem *pMem, FuncDef *pFunc){
   return ctx.isError;
 }
 
+int sqlite3VdbeMemAggValue(Mem *pAccum, Mem *pOut, FuncDef *pFunc){
+  sqlite3_context ctx;
+  Mem t;
+  assert( pFunc!=0 );
+  assert( pFunc->xValue!=0 );
+  assert( (pAccum->flags & MEM_Null)!=0 || pFunc==pAccum->u.pDef );
+  assert( pAccum->db==0 || sqlite3_mutex_held(pAccum->db->mutex) );
+  memset(&ctx, 0, sizeof(ctx));
+  memset(&t, 0, sizeof(t));
+  t.flags = MEM_Null;
+  t.db = pAccum->db;
+  ctx.pOut = pOut;
+  ctx.pMem = pAccum;
+  ctx.pFunc = pFunc;
+  pFunc->xValue(&ctx);
+  return ctx.isError;
+}
 /*
 ** If the memory cell contains a value that must be freed by
 ** invoking the external callback in Mem.xDel, then this routine