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TiDBHintGenerator.java
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219 lines (200 loc) · 6.45 KB
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package sqlancer.tidb.gen;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import sqlancer.IgnoreMeException;
import sqlancer.Randomly;
import sqlancer.common.schema.TableIndex;
import sqlancer.tidb.TiDBSchema.TiDBTable;
import sqlancer.tidb.ast.TiDBSelect;
import sqlancer.tidb.ast.TiDBText;
public class TiDBHintGenerator {
private final TiDBSelect select;
private final List<TiDBTable> tables;
private final StringBuilder sb = new StringBuilder();
enum IndexHint {
MERGE_JOIN, //
INL_JOIN, //
INL_HASH_JOIN, //
INL_MERGE_JOIN, //
HASH_JOIN, //
READ_FROM_TIKV, //
READ_FROM_TIFLASH, //
HASH_AGG, //
STREAM_AGG, //
USE_INDEX, //
IGNORE_INDEX, //
AGG_TO_COP, //
USE_INDEX_MERGE, //
NO_INDEX_MERGE, //
USE_TOJA, //
HASH_JOIN_BUILD, //
HASH_JOIN_PROBE, //
MPP_1PHASE_AGG, //
MPP_2PHASE_AGG, //
LIMIT_TO_COP, //
SHUFFLE_JOIN, //
BROADCAST_JOIN
}
public TiDBHintGenerator(TiDBSelect select, List<TiDBTable> tables) {
this.select = select;
this.tables = tables;
}
public static void generateHints(TiDBSelect select, List<TiDBTable> tables) {
new TiDBHintGenerator(select, tables).randomHint();
}
public static List<TiDBText> generateAllHints(TiDBSelect select, List<TiDBTable> tables) {
TiDBHintGenerator generator = new TiDBHintGenerator(select, tables);
return generator.allHints();
}
private void randomHint() {
TiDBTable table = Randomly.fromList(tables);
IndexHint chosenhint = Randomly.fromOptions(IndexHint.values());
generate(table, chosenhint);
}
private List<TiDBText> allHints() {
List<TiDBText> results = new ArrayList<>();
IndexHint[] values = IndexHint.values();
List<IndexHint> availableHints = new ArrayList<>(Arrays.asList(values));
for (IndexHint hint : availableHints) {
try {
TiDBText generatedHint = generate(Randomly.fromList(tables), hint);
results.add(generatedHint);
} catch (IgnoreMeException e) {
continue;
}
}
return results;
}
private TiDBText generate(TiDBTable table, IndexHint chosenhint) {
sb.setLength(0);
switch (chosenhint) {
case MERGE_JOIN:
tablesHint("MERGE_JOIN");
break;
case INL_JOIN:
tablesHint("INL_JOIN");
break;
case INL_HASH_JOIN:
tablesHint("INL_HASH_JOIN");
break;
case INL_MERGE_JOIN:
tablesHint("INL_MERGE_JOIN");
break;
case HASH_JOIN:
tablesHint("HASH_JOIN");
break;
case READ_FROM_TIKV:
storageHint("READ_FROM_STORAGE(TIKV");
break;
case READ_FROM_TIFLASH:
storageHint("READ_FROM_STORAGE(TIFLASH");
break;
case HASH_AGG:
sb.append("HASH_AGG()");
break;
case STREAM_AGG:
sb.append("STREAM_AGG()");
break;
case MPP_1PHASE_AGG:
sb.append("MPP_1PHASE_AGG()");
break;
case MPP_2PHASE_AGG:
sb.append("MPP_2PHASE_AGG()");
break;
case LIMIT_TO_COP:
sb.append("LIMIT_TO_COP()");
break;
case USE_INDEX:
indexesHint("USE_INDEX");
break;
case IGNORE_INDEX:
indexesHint("IGNORE_INDEX");
break;
case AGG_TO_COP:
sb.append("AGG_TO_COP()");
break;
case SHUFFLE_JOIN:
twoTablesHint("SHUFFLE_JOIN", table);
break;
case USE_INDEX_MERGE:
if (Randomly.getBoolean()) {
if (table.hasIndexes()) {
tablesHint("USE_INDEX_MERGE");
} else {
throw new IgnoreMeException();
}
} else {
twoTablesHint("USE_INDEX_MERGE", table);
}
break;
case NO_INDEX_MERGE:
sb.append("NO_INDEX_MERGE()");
break;
case USE_TOJA:
sb.append("USE_TOJA(");
sb.append(Randomly.getBoolean());
sb.append(")");
break;
case HASH_JOIN_BUILD:
tablesHint("HASH_JOIN_BUILD");
break;
case HASH_JOIN_PROBE:
tablesHint("HASH_JOIN_PROBE");
break;
case BROADCAST_JOIN:
twoTablesHint("BROADCAST_JOIN", table);
break;
default:
throw new AssertionError();
}
TiDBText hint = new TiDBText(sb.toString());
select.setHint(hint);
return hint;
}
private void indexesHint(String string) {
sb.append(string);
sb.append("(");
// FIXME: select one table
TiDBTable table = Randomly.fromList(tables);
List<TableIndex> allIndexes = table.getIndexes();
if (allIndexes.isEmpty()) {
throw new IgnoreMeException();
}
List<TableIndex> indexSubset = Randomly.nonEmptySubset(allIndexes);
sb.append(table.getName());
sb.append(", ");
sb.append(indexSubset.stream().map(i -> i.getIndexName()).distinct().collect(Collectors.joining(", ")));
sb.append(")");
}
private void tablesHint(String string) {
sb.append(string);
sb.append("(");
appendTables();
sb.append(")");
}
private void storageHint(String string) {
sb.append(string);
sb.append("[");
appendTables();
sb.append("])");
}
private void twoTablesHint(String string, TiDBTable table) {
if (table.hasIndexes()) {
sb.append(string);
sb.append("(");
sb.append(table.getName());
sb.append(", ");
List<TableIndex> indexes = Randomly.nonEmptySubset(table.getIndexes());
sb.append(indexes.stream().map(i -> i.getIndexName()).collect(Collectors.joining(", ")));
sb.append(")");
} else {
throw new IgnoreMeException();
}
}
private void appendTables() {
List<TiDBTable> tableSubset = Randomly.nonEmptySubset(tables);
sb.append(tableSubset.stream().map(t -> t.getName()).collect(Collectors.joining(", ")));
}
}