can't get partition key value 
## Bug Report

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### Which version of ShardingSphere did you use?
3.1.0
### Which project did you use? Sharding-JDBC or Sharding-Proxy?
Sharding-Proxy
### Expected behavior
    ps = connection.prepareStatement("select * from t_order where merc_no='1234567891' and tx_dt in ('20190102', '20190103') limit 0,10 ");



08:38:35.467 [main] INFO MyComplexKeysShardingAlgorithm - collection:["ds_0","ds_1","ds_2","ds_3"],shardingValues:[{"columnName":"merc_no","logicTableName":"t_order","values"**:[-1]**},{"columnName":"tx_dt","logicTableName":"t_order",**"values":[-1,-1]}**]
t_order:
  databaseStrategy:
    complex:
      shardingColumns: merc_no, tx_dt
      algorithmClassName: MyComplexKeysShardingAlgorithm
  tableStrategy:
    inline:
      shardingColumn: tx_dt
      algorithmExpression: t_order_${tx_dt}

### Actual behavior

### Reason analyze (If you can)

### Steps to reproduce the behavior, such as: SQL to execute, sharding rule configuration, when exception occur etc.

### Example codes for reproduce this issue (such as a github link).

diff --git a/sharding-core/src/main/java/io/shardingsphere/core/parsing/antlr/sql/segment/expr/CommonExpressionSegment.java b/sharding-core/src/main/java/io/shardingsphere/core/parsing/antlr/sql/segment/expr/CommonExpressionSegment.java
index d1e0e029c8f..13a4ed01a43 100644
--- a/sharding-core/src/main/java/io/shardingsphere/core/parsing/antlr/sql/segment/expr/CommonExpressionSegment.java
+++ b/sharding-core/src/main/java/io/shardingsphere/core/parsing/antlr/sql/segment/expr/CommonExpressionSegment.java
@@ -37,5 +37,5 @@ public final class CommonExpressionSegment extends ExpressionWithAliasSegment {
     
     private int index = -1;
     
-    private Number value = -1;
+    private Number value;
 }
['sharding-core/src/main/java/io/shardingsphere/core/parsing/antlr/sql/segment/expr/CommonExpressionSegment.java']