Fix up memory leakage created by recent changes.

diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c
index b3bfce9412265d9fe0a351e008aeed54464c394e..4f4eb760b5f849580b63a88beacd1f36364740f6 100644 (file)
--- a/src/backend/commands/analyze.c
+++ b/src/backend/commands/analyze.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *   $Header: /cvsroot/pgsql/src/backend/commands/analyze.c,v 1.36 2002/06/13 19:52:02 momjian Exp $
+ *   $Header: /cvsroot/pgsql/src/backend/commands/analyze.c,v 1.37 2002/06/15 22:25:40 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -59,7 +59,7 @@ typedef enum
 
 /*
  * We build one of these structs for each attribute (column) that is to be
- * analyzed.  The struct and subsidiary data are in TransactionCommandContext,
+ * analyzed.  The struct and subsidiary data are in anl_context,
  * so they live until the end of the ANALYZE operation.
  */
 typedef struct
@@ -109,6 +109,8 @@ typedef struct
 
 static int elevel = -1;
 
+static MemoryContext anl_context = NULL;
+
 /* context information for compare_scalars() */
 static FmgrInfo *datumCmpFn;
 static SortFunctionKind datumCmpFnKind;
@@ -155,6 +157,13 @@ analyze_rel(Oid relid, VacuumStmt *vacstmt)
    else
        elevel = DEBUG1;
 
+   /*
+    * Use the current context for storing analysis info.  vacuum.c ensures
+    * that this context will be cleared when I return, thus releasing the
+    * memory allocated here.
+    */
+   anl_context = CurrentMemoryContext;
+
    /*
     * Check for user-requested abort.  Note we want this to be inside a
     * transaction, so xact.c doesn't issue useless WARNING.
@@ -306,14 +315,14 @@ analyze_rel(Oid relid, VacuumStmt *vacstmt)
     * Compute the statistics.  Temporary results during the calculations
     * for each column are stored in a child context.  The calc routines
     * are responsible to make sure that whatever they store into the
-    * VacAttrStats structure is allocated in TransactionCommandContext.
+    * VacAttrStats structure is allocated in anl_context.
     */
    if (numrows > 0)
    {
        MemoryContext col_context,
                    old_context;
 
-       col_context = AllocSetContextCreate(CurrentMemoryContext,
+       col_context = AllocSetContextCreate(anl_context,
                                            "Analyze Column",
                                            ALLOCSET_DEFAULT_MINSIZE,
                                            ALLOCSET_DEFAULT_INITSIZE,
@@ -1094,8 +1103,8 @@ compute_minimal_stats(VacAttrStats *stats,
            Datum      *mcv_values;
            float4     *mcv_freqs;
 
-           /* Must copy the target values into TransactionCommandContext */
-           old_context = MemoryContextSwitchTo(TransactionCommandContext);
+           /* Must copy the target values into anl_context */
+           old_context = MemoryContextSwitchTo(anl_context);
            mcv_values = (Datum *) palloc(num_mcv * sizeof(Datum));
            mcv_freqs = (float4 *) palloc(num_mcv * sizeof(float4));
            for (i = 0; i < num_mcv; i++)
@@ -1415,8 +1424,8 @@ compute_scalar_stats(VacAttrStats *stats,
            Datum      *mcv_values;
            float4     *mcv_freqs;
 
-           /* Must copy the target values into TransactionCommandContext */
-           old_context = MemoryContextSwitchTo(TransactionCommandContext);
+           /* Must copy the target values into anl_context */
+           old_context = MemoryContextSwitchTo(anl_context);
            mcv_values = (Datum *) palloc(num_mcv * sizeof(Datum));
            mcv_freqs = (float4 *) palloc(num_mcv * sizeof(float4));
            for (i = 0; i < num_mcv; i++)
@@ -1501,8 +1510,8 @@ compute_scalar_stats(VacAttrStats *stats,
                nvals = values_cnt;
            Assert(nvals >= num_hist);
 
-           /* Must copy the target values into TransactionCommandContext */
-           old_context = MemoryContextSwitchTo(TransactionCommandContext);
+           /* Must copy the target values into anl_context */
+           old_context = MemoryContextSwitchTo(anl_context);
            hist_values = (Datum *) palloc(num_hist * sizeof(Datum));
            for (i = 0; i < num_hist; i++)
            {
@@ -1530,8 +1539,8 @@ compute_scalar_stats(VacAttrStats *stats,
            double      corr_xsum,
                        corr_x2sum;
 
-           /* Must copy the target values into TransactionCommandContext */
-           old_context = MemoryContextSwitchTo(TransactionCommandContext);
+           /* Must copy the target values into anl_context */
+           old_context = MemoryContextSwitchTo(anl_context);
            corrs = (float4 *) palloc(sizeof(float4));
            MemoryContextSwitchTo(old_context);