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Store the collating sequence name for each column of a table as an

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extension to the column name, for an additional savings in the heap space
needed to hold the schema.

FossilOrigin-Name: 832ac4c1ee384be0de72a4bdd55ed87e0f8294e7df5eefcf6b4942db3d85a69e
This commit is contained in:
drh
2021-08-05 15:27:19 +00:00
parent 324f91a591
commit 65b400931d
11 changed files with 81 additions and 33 deletions
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12
src/sqliteInt.h
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@@ -2028,10 +2028,17 @@ struct Module {
** or equal to the table column index. It is
** equal if and only if there are no VIRTUAL
** columns to the left.
**
** Notes on zCnName:
** The zCnName field stores the name of the column, the datatype of the
** column, and the collating sequence for the column, in that order, all in
** a single allocation. Each string is 0x00 terminated. The datatype
** is only included if the COLFLAG_HASTYPE bit of colFlags is set and the
** collating sequence name is only included if the COLFLAG_HASCOLL bit is
** set.
*/
struct Column {
char *zCnName; /* Name of this column */
char *zCnColl; /* Collating sequence. If NULL, use the default */
u8 notNull : 4; /* An OE_ code for handling a NOT NULL constraint */
u8 eType : 4; /* One of the standard types */
char affinity; /* One of the SQLITE_AFF_... values */
@@ -2072,6 +2079,7 @@ struct Column {
#define COLFLAG_STORED 0x0040 /* GENERATED ALWAYS AS ... STORED */
#define COLFLAG_NOTAVAIL 0x0080 /* STORED column not yet calculated */
#define COLFLAG_BUSY 0x0100 /* Blocks recursion on GENERATED columns */
#define COLFLAG_HASCOLL 0x0200 /* Has collating sequence name in zCnName */
#define COLFLAG_GENERATED 0x0060 /* Combo: _STORED, _VIRTUAL */
#define COLFLAG_NOINSERT 0x0062 /* Combo: _HIDDEN, _STORED, _VIRTUAL */
@@ -4398,6 +4406,8 @@ void sqlite3CollapseDatabaseArray(sqlite3*);
void sqlite3CommitInternalChanges(sqlite3*);
void sqlite3ColumnSetExpr(Parse*,Table*,Column*,Expr*);
Expr *sqlite3ColumnExpr(Table*,Column*);
void sqlite3ColumnSetColl(sqlite3*,Column*,const char*zColl);
const char *sqlite3ColumnColl(Column*);
void sqlite3DeleteColumnNames(sqlite3*,Table*);
void sqlite3GenerateColumnNames(Parse *pParse, Select *pSelect);
int sqlite3ColumnsFromExprList(Parse*,ExprList*,i16*,Column**);