fix(sqlite): implement PARSE_COLNAMES column name parsing
#5923
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WalkthroughThe changes update how column names and descriptions are retrieved from SQLite statements. The Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant Cursor
participant Connection
participant Statement
User->>Cursor: Request column description
Cursor->>Connection: Access detect_types flag
Cursor->>Statement: columns_description(detect_types, vm)
Statement->>Statement: columns_name(detect_types, vm)
Statement->>Statement: Strip type annotations if PARSE_COLNAMES set
Statement-->>Cursor: Return processed column names/descriptions
Cursor-->>User: Return column description
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ever0de
changed the title
PARSE_COLNAMES column name parsing in sqlite3PARSE_COLNAMES column name parsing
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Summary of Changes
Hello @ever0de, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request introduces a fix to the sqlite3 module's column name parsing, specifically implementing the PARSE_COLNAMES behavior to align with CPython's sqlite3 module. This ensures that column names returned by queries can be automatically stripped of type information (e.g., [type]) when the PARSE_COLNAMES flag is enabled, improving compatibility and consistency.
Highlights
PARSE_COLNAMESImplementation: Thecolumns_namefunction now correctly processes column names by stripping trailing type information (e.g.,[INTEGER]) when thePARSE_COLNAMESflag is active. This involves identifying and removing the first[character and any preceding space, mirroring CPython's behavior.- Contextual
detect_typesPassing: Thecolumns_descriptionfunction has been updated to receive theConnectionobject, allowing it to pass the connection'sdetect_typesflag tocolumns_name. This ensures that the column name parsing logic is applied conditionally based on the connection's configuration. - API Adjustments: Calls to
columns_descriptionwithin the_sqlitemodule have been updated to provide the necessaryconnectionobject, reflecting the change in its function signature.
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Code Review
This pull request implements the PARSE_COLNAMES option for the SQLite module, enabling column name parsing. The changes involve modifying the columns_name function to strip column names based on the detect_types flag and updating the columns_description function to pass the connection's detect_types value. Several suggestions were made to improve code readability and robustness.
| @@ -2726,22 +2726,48 @@ mod _sqlite { | |||
| unsafe { sqlite3_column_name(self.st, pos) } | |||
| } | |||
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| fn columns_name(self, vm: &VirtualMachine) -> PyResult<Vec<PyStrRef>> { | |||
| fn columns_name(self, detect_types: i32, vm: &VirtualMachine) -> PyResult<Vec<PyStrRef>> { | |||
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The detect_types parameter is an integer, but it's being treated as a boolean flag using bitwise operations. It would improve readability to rename it to detect_colnames to clearly indicate its purpose.
fn columns_name(detect_colnames: i32, vm: &VirtualMachine) -> PyResult<Vec<PyStrRef>> {There was a problem hiding this comment.
I'll leave the self requirement in columns_name for now, as it's part of the existing implementation.
stdlib/src/sqlite.rs
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| let end_pos = if bracket_pos > 0 | ||
| && name_str.chars().nth(bracket_pos - 1) == Some(' ') | ||
| { | ||
| bracket_pos - 1 | ||
| } else { | ||
| bracket_pos | ||
| }; |
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This logic checks for a single space before the '[' character. It might be more robust to trim any whitespace before the bracket to handle cases with multiple spaces or tabs.
let end_pos = name_str[..bracket_pos].trim_end().len();There was a problem hiding this comment.
I'm not sure about this comment. It seems this isn't the case in CPython. Should we use trim_end?
stdlib/src/sqlite.rs
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| if self.column_count() == 0 { | ||
| return Ok(None); | ||
| } | ||
| let columns = self | ||
| .columns_name(vm)? | ||
| .columns_name(connection.detect_types, vm)? |
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Passing connection.detect_types directly into columns_name exposes the internal state of the Connection object. Consider creating a dedicated method on Connection to encapsulate this logic and avoid direct access to the detect_types field.
.columns_name(connection.get_detect_types(), vm)?
stdlib/src/sqlite.rs
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| let processed_name = if detect_types & PARSE_COLNAMES != 0 { | ||
| // Find the position of the first '[' | ||
| if let Some(bracket_pos) = name_str.find('[') { |
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| let processed_name = if detect_types & PARSE_COLNAMES != 0 { | |
| // Find the position of the first '[' | |
| if let Some(bracket_pos) = name_str.find('[') { | |
| let processed_name = if detect_types & PARSE_COLNAMES != 0 && | |
| // Find the position of the first '[' | |
| let Some(bracket_pos) = name_str.find('[') { |
The latest stable Rust allows to use let chaining
stdlib/src/sqlite.rs
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| } else { | ||
| name_str | ||
| } |
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| } else { | |
| name_str | |
| } |
Then this else condition can be removed
Reference
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New Features
Bug Fixes