diff --git a/core/src/main/java/io/questdb/griffin/engine/functions/date/TimestampSequenceFunctionFactory.java b/core/src/main/java/io/questdb/griffin/engine/functions/date/TimestampSequenceFunctionFactory.java
index 7f0da74ce978c371a8291b8283a00fd32420bc9b..55d578092b552851abf1b20e547faf9ce22c41b7 100644
--- a/core/src/main/java/io/questdb/griffin/engine/functions/date/TimestampSequenceFunctionFactory.java
+++ b/core/src/main/java/io/questdb/griffin/engine/functions/date/TimestampSequenceFunctionFactory.java
@@ -38,34 +38,28 @@ import io.questdb.std.ObjList;
 public class TimestampSequenceFunctionFactory implements FunctionFactory {
     @Override
     public String getSignature() {
-        return "timestamp_sequence(nl)";
+        return "timestamp_sequence(nL)";
     }
 
     @Override
     public Function newInstance(ObjList<Function> args, int position, CairoConfiguration configuration) throws SqlException {
         final long start = args.getQuick(0).getTimestamp(null);
-        final long increment = args.getQuick(1).getLong(null);
-        if (increment < 0) {
-            throw SqlException.$(args.getQuick(1).getPosition(), "positive increment expected");
-        }
-
         if (start == Numbers.LONG_NaN) {
             return new TimestampConstant(args.getQuick(0).getPosition(), Numbers.LONG_NaN);
         }
-
-        return new Func(position, start, increment);
+        return new TimestampSequenceFunction(position, start, args.getQuick(1));
     }
 
-    private static final class Func extends TimestampFunction {
-        private final long increment;
+    private static final class TimestampSequenceFunction extends TimestampFunction {
+        private final Function longIncrement;
         private final long start;
         private long next;
 
-        public Func(int position, long start, long increment) {
+        public TimestampSequenceFunction(int position, long start, Function longIncrement) {
             super(position);
             this.start = start;
             this.next = start;
-            this.increment = increment;
+            this.longIncrement = longIncrement;
         }
 
         @Override
@@ -75,7 +69,7 @@ public class TimestampSequenceFunctionFactory implements FunctionFactory {
         @Override
         public long getTimestamp(Record rec) {
             final long result = next;
-            next += increment;
+            next += longIncrement.getLong(rec);
             return result;
         }
 
diff --git a/core/src/main/java/io/questdb/std/microtime/FixedTimeZoneRule.java b/core/src/main/java/io/questdb/std/microtime/FixedTimeZoneRule.java
index 0b9d580a778474295c119036a129f3ff59c627f4..2b54c772bf7cbd780ea9460a634f63e466bc7da6 100644
--- a/core/src/main/java/io/questdb/std/microtime/FixedTimeZoneRule.java
+++ b/core/src/main/java/io/questdb/std/microtime/FixedTimeZoneRule.java
@@ -25,18 +25,11 @@ package io.questdb.std.microtime;
 
 public class FixedTimeZoneRule implements TimeZoneRules {
     private final long offset;
-    private final String id;
 
-    public FixedTimeZoneRule(String id, long offset) {
-        this.id = id;
+    public FixedTimeZoneRule(long offset) {
         this.offset = offset;
     }
 
-    @Override
-    public String getId() {
-        return id;
-    }
-
     @Override
     public long getOffset(long millis, int year, boolean leap) {
         return offset;
diff --git a/core/src/main/java/io/questdb/std/microtime/TimeZoneRuleFactory.java b/core/src/main/java/io/questdb/std/microtime/TimeZoneRuleFactory.java
index deb7fb69a6e6bc0bff9f90b29541fad0cbd9a865..b149a3b14d38fc1571f66bcfeca388479208adce 100644
--- a/core/src/main/java/io/questdb/std/microtime/TimeZoneRuleFactory.java
+++ b/core/src/main/java/io/questdb/std/microtime/TimeZoneRuleFactory.java
@@ -40,7 +40,7 @@ public class TimeZoneRuleFactory {
     public TimeZoneRuleFactory() {
         int index = 0;
         for (String z : ZoneId.getAvailableZoneIds()) {
-            ruleList.add(new TimeZoneRulesImpl(z, ZoneId.of(z).getRules()));
+            ruleList.add(new TimeZoneRulesImpl(ZoneId.of(z).getRules()));
             ruleMap.put(z, index++);
         }
 
@@ -57,7 +57,7 @@ public class TimeZoneRuleFactory {
                     // this could be fixed offset, try parsing value as one
                     long offset = Timestamps.parseOffset(alias, 0, alias.length());
                     if (offset != Long.MIN_VALUE) {
-                        ruleList.add(new FixedTimeZoneRule(alias, Numbers.decodeLowInt(offset) * Timestamps.MILLI_MICROS));
+                        ruleList.add(new FixedTimeZoneRule(Numbers.decodeLowInt(offset) * Timestamps.MILLI_MICROS));
                         ruleMap.put(key, index++);
                     }
                 } else {
diff --git a/core/src/main/java/io/questdb/std/microtime/TimeZoneRules.java b/core/src/main/java/io/questdb/std/microtime/TimeZoneRules.java
index d588abc156cdab864f0eb880bee4e7901ddb7c0e..6c98d7b516e55741f68c5e29e5062911c288ec51 100644
--- a/core/src/main/java/io/questdb/std/microtime/TimeZoneRules.java
+++ b/core/src/main/java/io/questdb/std/microtime/TimeZoneRules.java
@@ -24,8 +24,6 @@
 package io.questdb.std.microtime;
 
 public interface TimeZoneRules {
-    String getId();
-
     long getOffset(long millis, int year, boolean leap);
 
     long getOffset(long millis);
diff --git a/core/src/main/java/io/questdb/std/microtime/TimeZoneRulesImpl.java b/core/src/main/java/io/questdb/std/microtime/TimeZoneRulesImpl.java
index 7652da9f11f97fa731f0087f63d0b64a8daaa177..4fa37ec59b170418a624f3fef73962c04e638c5b 100644
--- a/core/src/main/java/io/questdb/std/microtime/TimeZoneRulesImpl.java
+++ b/core/src/main/java/io/questdb/std/microtime/TimeZoneRulesImpl.java
@@ -46,11 +46,9 @@ public class TimeZoneRulesImpl implements TimeZoneRules {
     private final long firstWall;
     private final long lastWall;
     private final int historyOverlapCheckCutoff;
-    private final String id;
     private final long standardOffset;
 
-    public TimeZoneRulesImpl(String id, ZoneRules rules) {
-        this.id = id;
+    public TimeZoneRulesImpl(ZoneRules rules) {
         final long[] savingsInstantTransition = (long[]) Unsafe.getUnsafe().getObject(rules, SAVING_INSTANT_TRANSITION);
 
         if (savingsInstantTransition.length == 0) {
@@ -111,11 +109,6 @@ public class TimeZoneRulesImpl implements TimeZoneRules {
         this.lastWall = this.wallOffsets[wallOffsets.length - 1] * Timestamps.SECOND_MICROS;
     }
 
-    @Override
-    public String getId() {
-        return id;
-    }
-
     @Override
     public long getOffset(long micros, int year, boolean leap) {
         if (standardOffset != Long.MIN_VALUE) {
diff --git a/core/src/main/java/io/questdb/std/time/FixedTimeZoneRule.java b/core/src/main/java/io/questdb/std/time/FixedTimeZoneRule.java
index c4e69b3d1f98160a9beae5df8a4752cc8f124e20..2fdcca3e96b0ab356faecd5fa9dd9335c03a2659 100644
--- a/core/src/main/java/io/questdb/std/time/FixedTimeZoneRule.java
+++ b/core/src/main/java/io/questdb/std/time/FixedTimeZoneRule.java
@@ -25,18 +25,11 @@ package io.questdb.std.time;
 
 public class FixedTimeZoneRule implements TimeZoneRules {
     private final long offset;
-    private final String id;
 
-    public FixedTimeZoneRule(String id, long offset) {
-        this.id = id;
+    public FixedTimeZoneRule(long offset) {
         this.offset = offset;
     }
 
-    @Override
-    public String getId() {
-        return id;
-    }
-
     @Override
     public long getOffset(long millis, int year, boolean leap) {
         return offset;
diff --git a/core/src/main/java/io/questdb/std/time/TimeZoneRuleFactory.java b/core/src/main/java/io/questdb/std/time/TimeZoneRuleFactory.java
index 6956ea061a23a7a0703a6254a3205f3e6b6aa47a..8a09d50a6a6196840a4227002419610d93639664 100644
--- a/core/src/main/java/io/questdb/std/time/TimeZoneRuleFactory.java
+++ b/core/src/main/java/io/questdb/std/time/TimeZoneRuleFactory.java
@@ -40,7 +40,7 @@ public class TimeZoneRuleFactory {
     public TimeZoneRuleFactory() {
         int index = 0;
         for (String z : ZoneId.getAvailableZoneIds()) {
-            ruleList.add(new TimeZoneRulesImpl(z, ZoneId.of(z).getRules()));
+            ruleList.add(new TimeZoneRulesImpl(ZoneId.of(z).getRules()));
             ruleMap.put(z, index++);
         }
 
@@ -57,7 +57,7 @@ public class TimeZoneRuleFactory {
                     // this could be fixed offset, try parsing value as one
                     long offset = Dates.parseOffset(alias, 0, alias.length());
                     if (offset != Long.MIN_VALUE) {
-                        ruleList.add(new FixedTimeZoneRule(alias, Numbers.decodeLowInt(offset) * Dates.MINUTE_MILLIS));
+                        ruleList.add(new FixedTimeZoneRule(Numbers.decodeLowInt(offset) * Dates.MINUTE_MILLIS));
                         ruleMap.put(key, index++);
                     }
                 } else {
diff --git a/core/src/main/java/io/questdb/std/time/TimeZoneRules.java b/core/src/main/java/io/questdb/std/time/TimeZoneRules.java
index d8d158ba1a3e85783ea1f97fd51996388d770bd7..22fdc862dd698fd4da01bffef45161c572a4475c 100644
--- a/core/src/main/java/io/questdb/std/time/TimeZoneRules.java
+++ b/core/src/main/java/io/questdb/std/time/TimeZoneRules.java
@@ -24,8 +24,6 @@
 package io.questdb.std.time;
 
 public interface TimeZoneRules {
-    String getId();
-
     long getOffset(long millis, int year, boolean leap);
 
     long getOffset(long millis);
diff --git a/core/src/main/java/io/questdb/std/time/TimeZoneRulesImpl.java b/core/src/main/java/io/questdb/std/time/TimeZoneRulesImpl.java
index 698f3542874f57a20a911934706eb02e5c46a80b..c5a2924af43685684d3d3a5d4bc9c1e83a0a5c3a 100644
--- a/core/src/main/java/io/questdb/std/time/TimeZoneRulesImpl.java
+++ b/core/src/main/java/io/questdb/std/time/TimeZoneRulesImpl.java
@@ -46,11 +46,9 @@ public class TimeZoneRulesImpl implements TimeZoneRules {
     private final long firstWall;
     private final long lastWall;
     private final int historyOverlapCheckCutoff;
-    private final String id;
     private final long standardOffset;
 
-    public TimeZoneRulesImpl(String id, ZoneRules rules) {
-        this.id = id;
+    public TimeZoneRulesImpl(ZoneRules rules) {
         final long[] savingsInstantTransition = (long[]) Unsafe.getUnsafe().getObject(rules, SAVING_INSTANT_TRANSITION);
 
         if (savingsInstantTransition.length == 0) {
@@ -111,11 +109,6 @@ public class TimeZoneRulesImpl implements TimeZoneRules {
         this.lastWall = this.wallOffsets[wallOffsets.length - 1] * Dates.SECOND_MILLIS;
     }
 
-    @Override
-    public String getId() {
-        return id;
-    }
-
     @Override
     public long getOffset(long millis, int year, boolean leap) {
         if (standardOffset != Long.MIN_VALUE) {
diff --git a/core/src/test/java/io/questdb/griffin/engine/functions/date/TimestampSequenceFunctionFactoryTest.java b/core/src/test/java/io/questdb/griffin/engine/functions/date/TimestampSequenceFunctionFactoryTest.java
index 0398fc0f9b40f0207a8c69aeeb27d178003d55c9..badc41e513c156a4567dbb7542316d51a2ea3246 100644
--- a/core/src/test/java/io/questdb/griffin/engine/functions/date/TimestampSequenceFunctionFactoryTest.java
+++ b/core/src/test/java/io/questdb/griffin/engine/functions/date/TimestampSequenceFunctionFactoryTest.java
@@ -34,11 +34,6 @@ import org.junit.Test;
 
 public class TimestampSequenceFunctionFactoryTest extends AbstractFunctionFactoryTest {
 
-    @Test
-    public void testIncrement1() throws SqlException {
-        assertFunction(call(0L, 1000L).getFunction1());
-    }
-
     @Test
     public void testIncrement2() throws SqlException {
         assertFunction(call(0L, 1000L).getFunction2());
@@ -49,11 +44,6 @@ public class TimestampSequenceFunctionFactoryTest extends AbstractFunctionFactor
         call(Numbers.LONG_NaN, 1000L).andAssertTimestamp(Numbers.LONG_NaN);
     }
 
-    @Test
-    public void testNegativeIncrement() {
-        assertFailure(35, "positive increment expected", 0L, -100L);
-    }
-
     @Override
     protected void addExtraFunctions() {
         functions.add(new NegIntFunctionFactory());
diff --git a/core/src/test/java/io/questdb/std/microtime/TimeZoneRulesImplTest.java b/core/src/test/java/io/questdb/std/microtime/TimeZoneRulesImplTest.java
index a0d9f2b85f1dd2f2890f281f4b207e444e0eec62..ac0f42e46d742bf28b6e188d5bfee963846a2f63 100644
--- a/core/src/test/java/io/questdb/std/microtime/TimeZoneRulesImplTest.java
+++ b/core/src/test/java/io/questdb/std/microtime/TimeZoneRulesImplTest.java
@@ -47,7 +47,7 @@ public class TimeZoneRulesImplTest {
         for (String z : zoneList) {
             ZoneId zone = ZoneId.of(z);
             zones.add(zone);
-            zoneRules.add(new TimeZoneRulesImpl(z, zone.getRules()));
+            zoneRules.add(new TimeZoneRulesImpl(zone.getRules()));
         }
 
         long micros = Timestamps.toMicros(1900, 1, 1, 0, 0);
@@ -100,7 +100,7 @@ public class TimeZoneRulesImplTest {
         for (String z : zoneList) {
             ZoneId zone = ZoneId.of(z);
             zones.add(zone);
-            zoneRules.add(new TimeZoneRulesImpl(z, zone.getRules()));
+            zoneRules.add(new TimeZoneRulesImpl(zone.getRules()));
         }
 
         long millis = Timestamps.toMicros(1900, 1, 1, 0, 0);
@@ -117,7 +117,7 @@ public class TimeZoneRulesImplTest {
     @Test
     public void testSingle() {
         ZoneId zone = ZoneId.of("GMT");
-        TimeZoneRulesImpl rules = new TimeZoneRulesImpl("GMT", zone.getRules());
+        TimeZoneRulesImpl rules = new TimeZoneRulesImpl(zone.getRules());
 
         int y = 2017;
         int m = 3;
diff --git a/core/src/test/java/io/questdb/std/time/TimeZoneRulesImplTest.java b/core/src/test/java/io/questdb/std/time/TimeZoneRulesImplTest.java
index f119701ed102985b09855da5076c847df4bb0912..a44577f0d8d7a334a331a37f5a5642901e2c7fea 100644
--- a/core/src/test/java/io/questdb/std/time/TimeZoneRulesImplTest.java
+++ b/core/src/test/java/io/questdb/std/time/TimeZoneRulesImplTest.java
@@ -47,7 +47,7 @@ public class TimeZoneRulesImplTest {
         for (String z : zoneList) {
             ZoneId zone = ZoneId.of(z);
             zones.add(zone);
-            zoneRules.add(new TimeZoneRulesImpl(z, zone.getRules()));
+            zoneRules.add(new TimeZoneRulesImpl(zone.getRules()));
         }
 
         long micros = Dates.toMillis(1900, 1, 1, 0, 0);
@@ -100,7 +100,7 @@ public class TimeZoneRulesImplTest {
         for (String z : zoneList) {
             ZoneId zone = ZoneId.of(z);
             zones.add(zone);
-            zoneRules.add(new TimeZoneRulesImpl(z, zone.getRules()));
+            zoneRules.add(new TimeZoneRulesImpl(zone.getRules()));
         }
 
         long millis = Dates.toMillis(1900, 1, 1, 0, 0);
@@ -117,7 +117,7 @@ public class TimeZoneRulesImplTest {
     @Test
     public void testSingle() {
         ZoneId zone = ZoneId.of("GMT");
-        TimeZoneRulesImpl rules = new TimeZoneRulesImpl("GMT", zone.getRules());
+        TimeZoneRulesImpl rules = new TimeZoneRulesImpl(zone.getRules());
 
         int y = 2017;
         int m = 3;