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Enhance the Index and Table objects so that they remember if their stats come

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from the sqlite_stat1 table.  Make the "PRAGMA stats" an SQLITE_DEBUG only
pragma.  Add the flags column to "PRAGMA stats".  These are all preliminary
steps toward a "PRAGMA analyze_ifneeded;" feature.

FossilOrigin-Name: 85026c8ee143bbd46565660fff8346ef81421546
This commit is contained in:
drh
2017-02-17 13:38:15 +00:00
parent 7898bfff26
commit 33bec3f5e8
8 changed files with 121 additions and 100 deletions
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18
src/sqliteInt.h
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@@ -1879,15 +1879,14 @@ struct Table {
** the TF_OOOHidden attribute would apply in this case. Such tables require
** special handling during INSERT processing.
*/
#define TF_Readonly 0x01 /* Read-only system table */
#define TF_Ephemeral 0x02 /* An ephemeral table */
#define TF_HasPrimaryKey 0x04 /* Table has a primary key */
#define TF_Autoincrement 0x08 /* Integer primary key is autoincrement */
/* available for reuse: 0x10 */
#define TF_WithoutRowid 0x20 /* No rowid. PRIMARY KEY is the key */
#define TF_NoVisibleRowid 0x40 /* No user-visible "rowid" column */
#define TF_OOOHidden 0x80 /* Out-of-Order hidden columns */
#define TF_Readonly 0x0001 /* Read-only system table */
#define TF_Ephemeral 0x0002 /* An ephemeral table */
#define TF_HasPrimaryKey 0x0004 /* Table has a primary key */
#define TF_Autoincrement 0x0008 /* Integer primary key is autoincrement */
#define TF_HasStat1 0x0010 /* Has STAT1 data */
#define TF_WithoutRowid 0x0020 /* No rowid. PRIMARY KEY is the key */
#define TF_NoVisibleRowid 0x0040 /* No user-visible "rowid" column */
#define TF_OOOHidden 0x0080 /* Out-of-Order hidden columns */
/*
** Test to see whether or not a table is a virtual table. This is
@@ -2130,6 +2129,7 @@ struct Index {
unsigned isResized:1; /* True if resizeIndexObject() has been called */
unsigned isCovering:1; /* True if this is a covering index */
unsigned noSkipScan:1; /* Do not try to use skip-scan if true */
unsigned hasStat1:1; /* True if stat1 data has been loaded */
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
int nSample; /* Number of elements in aSample[] */
int nSampleCol; /* Size of IndexSample.anEq[] and so on */