// GetPlan returns the ExecPlan that for the query. Plans are cached in a cache.LRUCache.
func (si *SchemaInfo) GetPlan(ctx context.Context, logStats *LogStats, sql string) *ExecPlan {
span := trace.NewSpanFromContext(ctx)
span.StartLocal("SchemaInfo.GetPlan")
defer span.Finish()
// Fastpath if plan already exists.
if plan := si.getQuery(sql); plan != nil {
return plan
}
// TODO(sougou): It's not correct to hold this lock here because the code
// below runs queries against MySQL. But if we don't hold the lock, there
// are other race conditions where identical queries will end up building
// plans and compete with populating the query cache. In other words, we
// need a more elaborate scheme that blocks less, but still prevents these
// race conditions.
si.mu.Lock()
defer si.mu.Unlock()
// Recheck. A plan might have been built by someone else.
if plan := si.getQuery(sql); plan != nil {
return plan
}
var tableInfo *TableInfo
GetTable := func(tableName string) (table *schema.Table, ok bool) {
tableInfo, ok = si.tables[tableName]
if !ok {
return nil, false
}
return tableInfo.Table, true
}
splan, err := planbuilder.GetExecPlan(sql, GetTable)
if err != nil {
panic(PrefixTabletError(vtrpcpb.ErrorCode_UNKNOWN_ERROR, err, ""))
}
plan := &ExecPlan{ExecPlan: splan, TableInfo: tableInfo}
plan.Rules = si.queryRuleSources.filterByPlan(sql, plan.PlanID, plan.TableName)
plan.Authorized = tableacl.Authorized(plan.TableName, plan.PlanID.MinRole())
if plan.PlanID.IsSelect() {
if plan.FieldQuery == nil {
log.Warningf("Cannot cache field info: %s", sql)
} else {
conn := getOrPanic(ctx, si.connPool)
defer conn.Recycle()
sql := plan.FieldQuery.Query
start := time.Now()
r, err := conn.Exec(ctx, sql, 1, true)
logStats.AddRewrittenSQL(sql, start)
if err != nil {
panic(PrefixTabletError(vtrpcpb.ErrorCode_UNKNOWN_ERROR, err, "Error fetching fields: "))
}
plan.Fields = r.Fields
}
} else if plan.PlanID == planbuilder.PlanDDL || plan.PlanID == planbuilder.PlanSet {
return plan
}
si.queries.Set(sql, plan)
return plan
}
func (si *SchemaInfo) GetPlan(logStats *SQLQueryStats, sql string) (plan *ExecPlan) {
// Fastpath if plan already exists.
if plan := si.getQuery(sql); plan != nil {
return plan
}
si.mu.Lock()
defer si.mu.Unlock()
// Recheck. A plan might have been built by someone else.
if plan := si.getQuery(sql); plan != nil {
return plan
}
var tableInfo *TableInfo
GetTable := func(tableName string) (table *schema.Table, ok bool) {
tableInfo, ok = si.tables[tableName]
if !ok {
return nil, false
}
return tableInfo.Table, true
}
splan, err := planbuilder.GetExecPlan(sql, GetTable)
if err != nil {
panic(NewTabletError(FAIL, "%s", err))
}
plan = &ExecPlan{ExecPlan: splan, TableInfo: tableInfo}
plan.Rules = si.rules.filterByPlan(sql, plan.PlanId, plan.TableName)
plan.Authorized = tableacl.Authorized(plan.TableName, plan.PlanId.MinRole())
if plan.PlanId.IsSelect() {
if plan.FieldQuery == nil {
log.Warningf("Cannot cache field info: %s", sql)
} else {
conn := getOrPanic(si.connPool)
defer conn.Recycle()
sql := plan.FieldQuery.Query
r, err := conn.ExecuteFetch(sql, 1, true)
logStats.QuerySources |= QUERY_SOURCE_MYSQL
logStats.NumberOfQueries += 1
logStats.AddRewrittenSql(sql)
if err != nil {
panic(NewTabletError(FAIL, "Error fetching fields: %v", err))
}
plan.Fields = r.Fields
}
} else if plan.PlanId == planbuilder.PLAN_DDL || plan.PlanId == planbuilder.PLAN_SET {
return plan
}
si.queries.Set(sql, plan)
return plan
}
// GetPlan returns the ExecPlan that for the query. Plans are cached in a cache.LRUCache.
func (si *SchemaInfo) GetPlan(ctx context.Context, logStats *SQLQueryStats, sql string) *ExecPlan {
// Fastpath if plan already exists.
if plan := si.getQuery(sql); plan != nil {
return plan
}
si.mu.Lock()
defer si.mu.Unlock()
// Recheck. A plan might have been built by someone else.
if plan := si.getQuery(sql); plan != nil {
return plan
}
var tableInfo *TableInfo
GetTable := func(tableName string) (table *schema.Table, ok bool) {
tableInfo, ok = si.tables[tableName]
if !ok {
return nil, false
}
return tableInfo.Table, true
}
splan, err := planbuilder.GetExecPlan(sql, GetTable)
if err != nil {
panic(PrefixTabletError(ErrFail, vtrpc.ErrorCode_UNKNOWN_ERROR, err, ""))
}
plan := &ExecPlan{ExecPlan: splan, TableInfo: tableInfo}
plan.Rules = QueryRuleSources.filterByPlan(sql, plan.PlanId, plan.TableName)
plan.Authorized = tableacl.Authorized(plan.TableName, plan.PlanId.MinRole())
if plan.PlanId.IsSelect() {
if plan.FieldQuery == nil {
log.Warningf("Cannot cache field info: %s", sql)
} else {
conn := getOrPanic(ctx, si.connPool)
defer conn.Recycle()
sql := plan.FieldQuery.Query
start := time.Now()
r, err := conn.Exec(ctx, sql, 1, true)
logStats.AddRewrittenSql(sql, start)
if err != nil {
panic(PrefixTabletError(ErrFail, vtrpc.ErrorCode_UNKNOWN_ERROR, err, "Error fetching fields: "))
}
plan.Fields = r.Fields
}
} else if plan.PlanId == planbuilder.PLAN_DDL || plan.PlanId == planbuilder.PLAN_SET {
return plan
}
si.queries.Set(sql, plan)
return plan
}