RaigorJiang opened a new pull request, #19337:
URL: https://github.com/apache/shardingsphere/pull/19337
Revise #18179.
### Before
```sql
mysql> SHOW ENCRYPT RULES;
ERROR 1997 (C1997): Runtime exception: [null]
mysql> CREATE ENCRYPT RULE t_encrypt (
-> COLUMNS(
->
(NAME=user_id,PLAIN=user_plain,CIPHER=user_cipher,TYPE(NAME=AES,PROPERTIES('aes-key-value'='123456abc'))),
-> (NAME=order_id, CIPHER =order_cipher,TYPE(NAME=MD5))
-> ),QUERY_WITH_CIPHER_COLUMN=true
-> );
ERROR 1997 (C1997): Runtime exception: [Cannot invoke
"org.apache.shardingsphere.distsql.parser.segment.AlgorithmSegment.getName()"
because the return value of
"org.apache.shardingsphere.encrypt.distsql.parser.segment.EncryptColumnSegment.getAssistedQueryEncryptor()"
is null]
```
##### Log
```sql
java.lang.IllegalStateException: null
at
com.google.common.base.Preconditions.checkState(Preconditions.java:492)
at
org.apache.shardingsphere.encrypt.distsql.handler.query.EncryptRuleQueryResultSet.init(EncryptRuleQueryResultSet.java:51)
at
org.apache.shardingsphere.proxy.backend.text.distsql.rql.RQLBackendHandler.execute(RQLBackendHandler.java:51)
at
org.apache.shardingsphere.proxy.backend.text.distsql.rql.RQLBackendHandler.execute(RQLBackendHandler.java:40)
java.lang.NullPointerException: Cannot invoke
"org.apache.shardingsphere.distsql.parser.segment.AlgorithmSegment.getName()"
because the return value of
"org.apache.shardingsphere.encrypt.distsql.parser.segment.EncryptColumnSegment.getAssistedQueryEncryptor()"
is null
at
org.apache.shardingsphere.encrypt.distsql.handler.converter.EncryptRuleStatementConverter.createAssistedQueryEncryptorConfiguration(EncryptRuleStatementConverter.java:80)
at
org.apache.shardingsphere.encrypt.distsql.handler.converter.EncryptRuleStatementConverter.createEncryptorConfigurations(EncryptRuleStatementConverter.java:70)
at
org.apache.shardingsphere.encrypt.distsql.handler.converter.EncryptRuleStatementConverter.convert(EncryptRuleStatementConverter.java:48)
```
### After
<img width="1236" alt="Snipaste_2022-07-18_23-40-24"
src="https://user-images.githubusercontent.com/5668787/179559625-6347f1b4-8a42-4244-84ff-f3e40205b316.png";>
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