public void validationPlanItem(PlanItem item) {
int priority = item.getScanningStrategy().priority;
if (tableRule instanceof ShardedTableRule) {
ShardedTableRule shardedTableRule = (ShardedTableRule) tableRule;
switch (shardedTableRule.getScanLevel()) {
case ShardedTableRule.SCANLEVEL_SHARDINGKEY:
if (priority < ScanningStrategy.USE_SHARDINGKEY.priority) {
throw DbException.get(
ErrorCode.ALLOWED_SCANTABLE_ERROR, getName(), "shardingKey", "shardingKey");
}
break;
case ShardedTableRule.SCANLEVEL_UNIQUEINDEX:
if (priority < ScanningStrategy.USE_UNIQUEKEY.priority) {
throw DbException.get(
ErrorCode.ALLOWED_SCANTABLE_ERROR, getName(), "uniqueIndex", "uniqueIndex");
}
break;
case ShardedTableRule.SCANLEVEL_ANYINDEX:
if (priority < ScanningStrategy.USE_INDEXKEY.priority) {
throw DbException.get(
ErrorCode.ALLOWED_SCANTABLE_ERROR, getName(), "indexKey", "indexKey");
}
break;
case ShardedTableRule.SCANLEVEL_UNLIMITED:
break;
default:
throw DbException.throwInternalError("invalid scanLevel");
}
}
}
/** validation the rule columns is in the table columns */
private void setRuleColumns() {
if (tableRule instanceof ShardedTableRule) {
ShardedTableRule shardedTableRule = (ShardedTableRule) tableRule;
String[] ruleColNames = shardedTableRule.getRuleColumns();
ruleColumns = new Column[ruleColNames.length];
for (int i = 0; i < ruleColNames.length; i++) {
String colName = database.identifier(ruleColNames[i]);
if (!doesColumnExist(colName)) {
throw DbException.get(ErrorCode.SHARDING_COLUMN_NOT_FOUND, colName, getName());
}
ruleColumns[i] = getColumn(colName);
}
}
}
public PlanItem getBestPlanItem(Session session, int[] masks, TableFilter[] filters, int filter) {
PlanItem item = new PlanItem();
item.cost = Constants.COST_ROW_OFFSET;
if (tableRule instanceof ShardedTableRule) {
ShardedTableRule shardedTableRule = (ShardedTableRule) tableRule;
int nodeCount = shardedTableRule.getObjectNodes().length;
item.cost = Constants.COST_ROW_OFFSET * nodeCount;
}
Column[] columns = getRuleColumns();
if (columns != null && masks != null) {
for (int i = 0, len = columns.length; i < len; i++) {
Column column = columns[i];
int index = column.getColumnId();
int mask = masks[index];
if ((mask & IndexCondition.EQUALITY) == IndexCondition.EQUALITY) {
if (i == columns.length - 1) {
item.cost = Constants.COST_ROW_OFFSET;
item.scanningStrategyFor(ScanningStrategy.USE_SHARDINGKEY);
break;
}
} else {
break;
}
}
}
double rowsCost = item.cost;
ArrayList<Index> indexes = getIndexes();
if (indexes != null && masks != null) {
for (Index index : indexes) {
columns = index.getColumns();
for (int i = 0, len = columns.length; i < len; i++) {
Column column = columns[i];
int columnId = column.getColumnId();
int mask = masks[columnId];
if ((mask & IndexCondition.EQUALITY) == IndexCondition.EQUALITY) {
if (i == columns.length - 1 && index.getIndexType().isUnique()) {
item.cost = rowsCost * 0.25d;
item.scanningStrategyFor(ScanningStrategy.USE_UNIQUEKEY);
break;
}
item.cost = Math.max(rowsCost * 0.5d, item.cost * 0.5d);
item.scanningStrategyFor(ScanningStrategy.USE_INDEXKEY);
} else if ((mask & IndexCondition.RANGE) == IndexCondition.RANGE) {
item.cost = item.cost * 0.70d;
item.scanningStrategyFor(ScanningStrategy.USE_INDEXKEY);
break;
} else if ((mask & IndexCondition.START) == IndexCondition.START) {
item.cost = item.cost * 0.75d;
item.scanningStrategyFor(ScanningStrategy.USE_INDEXKEY);
break;
} else if ((mask & IndexCondition.END) == IndexCondition.END) {
item.cost = item.cost * 0.75d;
item.scanningStrategyFor(ScanningStrategy.USE_INDEXKEY);
break;
} else {
break;
}
}
}
}
// validationPlanItem(item);
return item;
}