[jira] [Created] (IOTDB-4470) Use code generation to accelerate expression calculations
Xi Zhang created IOTDB-4470: --- Summary: Use code generation to accelerate expression calculations Key: IOTDB-4470 URL: https://issues.apache.org/jira/browse/IOTDB-4470 Project: Apache IoTDB Issue Type: New Feature Reporter: Xi Zhang Assignee: Xi Zhang when selecting expressions like (a+b)*c, iotdb use too many virtual function calls. we can avoid these repeat function call just generate source code `return (a+b)*c` and then compile it. We will get a much faster expression evaluator. -- This message was sent by Atlassian Jira (v8.20.10#820010)
[jira] [Created] (IOTDB-4197) Fix display of IS (NOT) NULL expression
Xi Zhang created IOTDB-4197: --- Summary: Fix display of IS (NOT) NULL expression Key: IOTDB-4197 URL: https://issues.apache.org/jira/browse/IOTDB-4197 Project: Apache IoTDB Issue Type: Bug Reporter: Xi Zhang Assignee: Xi Zhang Attachments: image-2022-08-21-15-52-30-604.png `select expression is null from ...` will be displayed as expression IS NOT NULL fix this bug !image-2022-08-21-15-52-30-604.png! -- This message was sent by Atlassian Jira (v8.20.10#820010)
[jira] [Created] (IOTDB-3068) Reduce redundant function call when calculate expressions
Xi Zhang created IOTDB-3068: --- Summary: Reduce redundant function call when calculate expressions Key: IOTDB-3068 URL: https://issues.apache.org/jira/browse/IOTDB-3068 Project: Apache IoTDB Issue Type: Improvement Reporter: Xi Zhang Assignee: Xi Zhang When calculate expressions, functions like getTSDatatype and isConstant are called for every single valid timestamp. But in fact, we just need to call them once. -- This message was sent by Atlassian Jira (v8.20.7#820007)
[jira] [Created] (IOTDB-3048) Structure of BinaryTransformer can be optimized
Xi Zhang created IOTDB-3048: --- Summary: Structure of BinaryTransformer can be optimized Key: IOTDB-3048 URL: https://issues.apache.org/jira/browse/IOTDB-3048 Project: Apache IoTDB Issue Type: Improvement Reporter: Xi Zhang Assignee: Xi Zhang A lot of switch case statements are used in BinaryTransformer, and the enum TransformerType seems to be redundant. We can rewrite it wilh sbstract methods -- This message was sent by Atlassian Jira (v8.20.7#820007)
[jira] [Created] (IOTDB-2912) Upgrade where clause to support more powerful expressions
Xi Zhang created IOTDB-2912: --- Summary: Upgrade where clause to support more powerful expressions Key: IOTDB-2912 URL: https://issues.apache.org/jira/browse/IOTDB-2912 Project: Apache IoTDB Issue Type: New Feature Reporter: Xi Zhang Assignee: Xi Zhang Current where clause in select just support simple compare expression and simple logic expression. We can upgrade the filter system to support complex expression with UDF supported. (Current filter system can just compare variables with constants.) -- This message was sent by Atlassian Jira (v8.20.1#820001)
[jira] [Created] (IOTDB-2888) Can't select expression with unary operator followed by a constant expression.
Xi Zhang created IOTDB-2888:
---
Summary: Can't select expression with unary operator followed by a
constant expression.
Key: IOTDB-2888
URL: https://issues.apache.org/jira/browse/IOTDB-2888
Project: Apache IoTDB
Issue Type: Bug
Components: Core/Query
Reporter: Xi Zhang
Assignee: Xi Zhang
When you select unary expression with a constant expression, it will throw
{quote}java.lang.UnsupportedOperationException
{quote}
for example
{quote}select - 1 + s1 from root.test;
{quote}
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[jira] [Created] (IOTDB-2882) schema display error
Xi Zhang created IOTDB-2882: --- Summary: schema display error Key: IOTDB-2882 URL: https://issues.apache.org/jira/browse/IOTDB-2882 Project: Apache IoTDB Issue Type: Bug Components: Core/Query Reporter: Xi Zhang Assignee: Xi Zhang Attachments: schema_error.jpg Display of the uniary expression for the query result may be wrong. -- This message was sent by Atlassian Jira (v8.20.1#820001)
