Index: pgjdbc/org/postgresql/core/Field.java
===================================================================
--- pgjdbc.orig/org/postgresql/core/Field.java
+++ pgjdbc/org/postgresql/core/Field.java
@@ -197,4 +197,9 @@ public class Field
         return schemaName;
     }
 
+    public String toString() {
+        return "Field("+ (columnName != null ? columnName : "") + "," +
+                Oid.toString(oid) + "," + length + "," +
+                (format == TEXT_FORMAT ? 'T' : 'B') + ")";
+    }
 }
Index: pgjdbc/org/postgresql/core/Oid.java
===================================================================
--- pgjdbc.orig/org/postgresql/core/Oid.java
+++ pgjdbc/org/postgresql/core/Oid.java
@@ -9,6 +9,8 @@
 */
 package org.postgresql.core;
 
+import java.lang.reflect.Field;
+
 /**
  * Provides constants for well-known backend OIDs for the types we commonly
  * use.
@@ -67,4 +69,24 @@ public class Oid {
     public static final int XML = 142;
     public static final int XML_ARRAY = 143;
 
+    /**
+     * Returns the name of the oid as string.
+     *
+     * @param oid The oid to convert to name.
+     * @return The name of the oid or "<unknown>" if oid no constant for
+     * oid value has been defined.
+     */
+    public static String toString(int oid) {
+        try {
+            Field[] fields = Oid.class.getFields();
+            for (int i = 0; i < fields.length; ++i) {
+                if (fields[i].getInt(null) == oid) {
+                    return fields[i].getName();
+                }
+            }
+        } catch (IllegalAccessException e) {
+            // never happens
+        }
+        return "<unknown>";
+    }
 }
Index: pgjdbc/org/postgresql/core/v3/QueryExecutorImpl.java
===================================================================
--- pgjdbc.orig/org/postgresql/core/v3/QueryExecutorImpl.java
+++ pgjdbc/org/postgresql/core/v3/QueryExecutorImpl.java
@@ -1851,7 +1851,7 @@ public class QueryExecutorImpl implement
                 break;
 
             case 'D':  // Data Transfer (ongoing Execute response)
-                Object tuple = null;
+                byte[][] tuple = null;
                 try {
                     tuple = pgStream.ReceiveTupleV3();
                 } catch(OutOfMemoryError oome) {
@@ -1868,8 +1868,19 @@ public class QueryExecutorImpl implement
                     tuples.addElement(tuple);
                 }
 
-                if (logger.logDebug())
-                    logger.debug(" <=BE DataRow");
+                if (logger.logDebug()) {
+                    int length;
+                    if (tuple == null) {
+                        length = -1;
+                    } else {
+                        length = 0;
+                        for (int i=0; i< tuple.length; ++i) {
+                            if (tuple[i] == null) continue;
+                            length += tuple[i].length;
+                        }
+                    }
+                    logger.debug(" <=BE DataRow(len=" + length + ")");
+                }
 
                 break;
 
@@ -2113,6 +2124,9 @@ public class QueryExecutorImpl implement
                                   "",  /* name not yet determined */
                                   typeOid, typeLength, typeModifier, tableOid, positionInTable);
             fields[i].setFormat(formatType);
+
+            if (logger.logDebug())
+                logger.debug("        " + fields[i]);
         }
 
         return fields;
Index: pgjdbc/org/postgresql/core/v3/SimpleQuery.java
===================================================================
--- pgjdbc.orig/org/postgresql/core/v3/SimpleQuery.java
+++ pgjdbc/org/postgresql/core/v3/SimpleQuery.java
@@ -120,9 +120,21 @@ class SimpleQuery implements V3Query {
         return encodedStatementName;
     }
 
+    /**
+     * Sets the fields that this query will return.
+     *
+     * @param fields The fields that this query will return.
+     */
     void setFields(Field[] fields) {
         this.fields = fields;
     }
+
+    /**
+     * Returns the fields that this query will return. If the result set fields
+     * are not known returns null.
+     *
+     * @return the fields that this query will return.
+     */
     Field[] getFields() {
         return fields;
     }
@@ -171,6 +183,10 @@ class SimpleQuery implements V3Query {
     private final ProtocolConnectionImpl protoConnection;
     private String statementName;
     private byte[] encodedStatementName;
+    /**
+     * The stored fields from previous query of a prepared statement,
+     * if executed before. Always null for non-prepared statements.
+     */
     private Field[] fields;
     private boolean portalDescribed;
     private boolean statementDescribed;
Index: pgjdbc/org/postgresql/jdbc2/AbstractJdbc2Connection.java
===================================================================
--- pgjdbc.orig/org/postgresql/jdbc2/AbstractJdbc2Connection.java
+++ pgjdbc/org/postgresql/jdbc2/AbstractJdbc2Connection.java
@@ -158,6 +158,8 @@ public abstract class AbstractJdbc2Conne
             logger.debug("    compatible = " + compatible);
             logger.debug("    loglevel = " + logLevel);
             logger.debug("    prepare threshold = " + prepareThreshold);
+            logger.debug("    types using binary send = " + oidsToString(useBinarySendForOids));
+            logger.debug("    types using binary receive = " + oidsToString(useBinaryReceiveForOids));
         }
 
         //
@@ -204,6 +206,21 @@ public abstract class AbstractJdbc2Conne
         }
     }
 
+    private String oidsToString(BitSet oids) {
+        StringBuffer sb = new StringBuffer();
+        int oid = -1;
+        while ((oid = oids.nextSetBit(oid + 1)) != -1) {
+            sb.append(Oid.toString(oid));
+            sb.append(',');
+        }
+        if (sb.length() > 0) {
+            sb.setLength(sb.length() - 1);
+        } else {
+            sb.append(" <none>");
+        }
+        return sb.toString();
+    }
+
     private final TimestampUtils timestampUtils;
     public TimestampUtils getTimestampUtils() { return timestampUtils; }