ISAR/rusqlite
3
0
Fork 0
mirror of https://github.com/isar/rusqlite.git synced 2024-11-23 00:39:20 +08:00
Code Issues Packages Projects Releases Wiki Activity

Sync series with official source

Browse Source
This commit is contained in:
gwenn 2021-02-28 12:43:46 +01:00
parent bd96f61e3f
commit 1acd753a63
1 changed files with 41 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

85
src/vtab/series.rs
View File

@ -13,7 +13,7 @@ use crate::vtab::{
eponymous_only_module, Context, IndexConstraintOp, IndexInfo, VTab, VTabConnection, VTabCursor,
Values,
};
use crate::{Connection, Result};
use crate::{Connection, Error, Result};
/// `feature = "series"` Register the "generate_series" module.
pub fn load_module(conn: &Connection) -> Result<()> {
@ -38,6 +38,8 @@ bitflags::bitflags! {
const STEP = 4;
// output in descending order
const DESC = 8;
// output in descending order
const ASC = 16;
// Both start and stop
const BOTH = QueryPlanFlags::START.bits | QueryPlanFlags::STOP.bits;
}
@ -71,54 +73,39 @@ unsafe impl<'vtab> VTab<'vtab> for SeriesTab {
fn best_index(&self, info: &mut IndexInfo) -> Result<()> {
// The query plan bitmask
let mut idx_num: QueryPlanFlags = QueryPlanFlags::empty();
// Index of the start= constraint
let mut start_idx = None;
// Index of the stop= constraint
let mut stop_idx = None;
// Index of the step= constraint
let mut step_idx = None;
// Mask of unusable constraints
let mut unusable_mask: QueryPlanFlags = QueryPlanFlags::empty();
// Constraints on start, stop, and step
let mut a_idx: [Option<usize>; 3] = [None, None, None];
for (i, constraint) in info.constraints().enumerate() {
if !constraint.is_usable() {
if constraint.column() < SERIES_COLUMN_START {
continue;
}
if constraint.operator() != IndexConstraintOp::SQLITE_INDEX_CONSTRAINT_EQ {
continue;
let (i_col, i_mask) = match constraint.column() {
SERIES_COLUMN_START => (0, QueryPlanFlags::START),
SERIES_COLUMN_STOP => (1, QueryPlanFlags::STOP),
SERIES_COLUMN_STEP => (2, QueryPlanFlags::STEP),
_ => {
unreachable!()
}
match constraint.column() {
SERIES_COLUMN_START => {
start_idx = Some(i);
idx_num |= QueryPlanFlags::START;
}
SERIES_COLUMN_STOP => {
stop_idx = Some(i);
idx_num |= QueryPlanFlags::STOP;
}
SERIES_COLUMN_STEP => {
step_idx = Some(i);
idx_num |= QueryPlanFlags::STEP;
}
_ => {}
};
if !constraint.is_usable() {
unusable_mask |= i_mask;
} else if constraint.operator() == IndexConstraintOp::SQLITE_INDEX_CONSTRAINT_EQ {
idx_num |= i_mask;
a_idx[i_col] = Some(i);
}
let mut num_of_arg = 0;
if let Some(start_idx) = start_idx {
num_of_arg += 1;
let mut constraint_usage = info.constraint_usage(start_idx);
constraint_usage.set_argv_index(num_of_arg);
}
// Number of arguments that SeriesTabCursor::filter expects
let mut n_arg = 0;
for j in a_idx.iter().flatten() {
n_arg += 1;
let mut constraint_usage = info.constraint_usage(*j);
constraint_usage.set_argv_index(n_arg);
constraint_usage.set_omit(true);
}
if let Some(stop_idx) = stop_idx {
num_of_arg += 1;
let mut constraint_usage = info.constraint_usage(stop_idx);
constraint_usage.set_argv_index(num_of_arg);
constraint_usage.set_omit(true);
}
if let Some(step_idx) = step_idx {
num_of_arg += 1;
let mut constraint_usage = info.constraint_usage(step_idx);
constraint_usage.set_argv_index(num_of_arg);
constraint_usage.set_omit(true);
if !(unusable_mask & !idx_num).is_empty() {
return Err(Error::SqliteFailure(ffi::Error::new(ffi::SQLITE_CONSTRAINT), None));
}
if idx_num.contains(QueryPlanFlags::BOTH) {
// Both start= and stop= boundaries are available.
@ -135,6 +122,8 @@ unsafe impl<'vtab> VTab<'vtab> for SeriesTab {
if let Some(order_by) = order_bys.next() {
if order_by.is_order_by_desc() {
idx_num |= QueryPlanFlags::DESC;
} else {
idx_num |= QueryPlanFlags::ASC;
}
true
} else {
@ -145,7 +134,9 @@ unsafe impl<'vtab> VTab<'vtab> for SeriesTab {
info.set_order_by_consumed(true);
}
} else {
info.set_estimated_cost(2_147_483_647f64);
// If either boundary is missing, we have to generate a huge span
// of numbers. Make this case very expensive so that the query
// planner will work hard to avoid it.
info.set_estimated_rows(2_147_483_647);
}
info.set_idx_num(idx_num.bits());
@ -193,7 +184,7 @@ impl SeriesTabCursor<'_> {
}
unsafe impl VTabCursor for SeriesTabCursor<'_> {
fn filter(&mut self, idx_num: c_int, _idx_str: Option<&str>, args: &Values<'_>) -> Result<()> {
let idx_num = QueryPlanFlags::from_bits_truncate(idx_num);
let mut idx_num = QueryPlanFlags::from_bits_truncate(idx_num);
let mut i = 0;
if idx_num.contains(QueryPlanFlags::START) {
self.min_value = args.get(i)?;
@ -209,8 +200,14 @@ unsafe impl VTabCursor for SeriesTabCursor<'_> {
}
if idx_num.contains(QueryPlanFlags::STEP) {
self.step = args.get(i)?;
if self.step < 1 {
#[allow(clippy::comparison_chain)]
if self.step == 0 {
self.step = 1;
} else if self.step < 0 {
self.step = -self.step;
if !idx_num.contains(QueryPlanFlags::ASC) {
idx_num |= QueryPlanFlags::DESC;
}
}
} else {
self.step = 1;