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Code Issues Releases Wiki Activity

improved parser performance.

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This commit is contained in:
wenshao
2017-08-26 22:53:51 +08:00
parent 76c441949f
commit a983b2685b
75 changed files with 2998 additions and 2053 deletions
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src/main/java/com/alibaba/druid/sql/dialect/postgresql/parser/PGExprParser.java
+19 -2
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@@ -40,11 +40,27 @@ import com.alibaba.druid.sql.dialect.postgresql.ast.expr.PGTypeCastExpr;
import com.alibaba.druid.sql.parser.Lexer;
import com.alibaba.druid.sql.parser.SQLExprParser;
import com.alibaba.druid.sql.parser.Token;
import com.alibaba.druid.util.FNVUtils;
import com.alibaba.druid.util.JdbcConstants;
import java.util.Arrays;
public class PGExprParser extends SQLExprParser {
public final static String[] AGGREGATE_FUNCTIONS = { "AVG", "COUNT", "MAX", "MIN", "STDDEV", "SUM", "ROW_NUMBER" };
public final static String[] AGGREGATE_FUNCTIONS;
public final static long[] AGGREGATE_FUNCTIONS_CODES;
static {
String[] strings = { "AVG", "COUNT", "MAX", "MIN", "STDDEV", "SUM", "ROW_NUMBER" };
AGGREGATE_FUNCTIONS_CODES = FNVUtils.fnv_64_lower(strings, true);
AGGREGATE_FUNCTIONS = new String[AGGREGATE_FUNCTIONS_CODES.length];
for (String str : strings) {
long hash = FNVUtils.fnv_64_lower(str);
int index = Arrays.binarySearch(AGGREGATE_FUNCTIONS_CODES, hash);
AGGREGATE_FUNCTIONS[index] = str;
}
}
public PGExprParser(String sql){
this(new PGLexer(sql));
@@ -55,6 +71,7 @@ public class PGExprParser extends SQLExprParser {
public PGExprParser(Lexer lexer){
super(lexer);
this.aggregateFunctions = AGGREGATE_FUNCTIONS;
this.aggregateFunctionHashCodes = AGGREGATE_FUNCTIONS_CODES;
this.dbType = JdbcConstants.POSTGRESQL;
}
@@ -159,7 +176,7 @@ public class PGExprParser extends SQLExprParser {
timestamp.setLiteral(literal);
accept(Token.LITERAL_CHARS);
if (identifierEquals("AT")) {
if (lexer.identifierEquals("AT")) {
lexer.nextToken();
acceptIdentifier("TIME");
acceptIdentifier("ZONE");