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Enhance Snowflake SQL parser support #6600

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b01b019
Enhance Snowflake SQL parser support
wenshao Feb 12, 2026
c4d3687
Add more Snowflake SQL parser test cases
wenshao Feb 12, 2026
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83 changes: 82 additions & 1 deletion core/src/main/java/com/alibaba/druid/sql/dialect/snowflake/SnowflakeExprParser.java
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Original file line number Diff line number Diff line change
@@ -1,10 +1,67 @@
package com.alibaba.druid.sql.dialect.snowflake;

import com.alibaba.druid.DbType;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLLimit;
import com.alibaba.druid.sql.parser.Lexer;
import com.alibaba.druid.sql.parser.SQLExprParser;
import com.alibaba.druid.sql.parser.SQLParserFeature;
import com.alibaba.druid.sql.parser.SQLSelectParser;
import com.alibaba.druid.sql.parser.Token;
import com.alibaba.druid.util.FnvHash;

public class SnowflakeExprParser extends SQLExprParser {
private static final String[] AGGREGATE_FUNCTIONS = {
"ANY_VALUE",
"APPROX_COUNT_DISTINCT",
"APPROX_PERCENTILE",
"APPROX_TOP_K",
"ARRAY_AGG",
"ARRAY_UNIQUE_AGG",
"AVG",
"BITAND_AGG",
"BITOR_AGG",
"BITXOR_AGG",
"BOOLAND_AGG",
"BOOLOR_AGG",
"BOOLXOR_AGG",
"COUNT",
"COUNT_IF",
"COVAR_POP",
"COVAR_SAMP",
"GROUPING",
"GROUPING_ID",
"HASH_AGG",
"KURTOSIS",
"LISTAGG",
"MAX",
"MAX_BY",
"MEDIAN",
"MIN",
"MIN_BY",
"MODE",
"PERCENTILE_CONT",
"PERCENTILE_DISC",
"RANK",
"DENSE_RANK",
"ROW_NUMBER",
"NTILE",
"SKEW",
"STDDEV",
"STDDEV_POP",
"STDDEV_SAMP",
"SUM",
"VAR_POP",
"VAR_SAMP",
"VARIANCE"
};

private static final long[] AGGREGATE_FUNCTIONS_CODES;

static {
AGGREGATE_FUNCTIONS_CODES = FnvHash.fnv1a_64_lower(AGGREGATE_FUNCTIONS, true);
}

public SnowflakeExprParser(String sql) {
this(new SnowflakeLexer(sql));
this.lexer.nextToken();
Expand All @@ -16,6 +73,30 @@ public SnowflakeExprParser(String sql, SQLParserFeature... features) {
}

public SnowflakeExprParser(Lexer lexer) {
super(lexer);
super(lexer, DbType.snowflake);
this.aggregateFunctions = AGGREGATE_FUNCTIONS;
this.aggregateFunctionHashCodes = AGGREGATE_FUNCTIONS_CODES;
}

@Override
public SQLSelectParser createSelectParser() {
return new SnowflakeSelectParser(this, null);
}

@Override
public SQLLimit parseLimit() {
SQLLimit limit = new SQLLimit();

accept(Token.LIMIT);

SQLExpr expr = this.expr();
limit.setRowCount(expr);

if (lexer.nextIf(Token.OFFSET)) {
SQLExpr offset = this.expr();
limit.setOffset(offset);
}

return limit;
}
}
92 changes: 92 additions & 0 deletions core/src/main/java/com/alibaba/druid/sql/dialect/snowflake/SnowflakeLexer.java
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@@ -1,10 +1,102 @@
package com.alibaba.druid.sql.dialect.snowflake;

import com.alibaba.druid.DbType;
import com.alibaba.druid.sql.parser.Keywords;
import com.alibaba.druid.sql.parser.Lexer;
import com.alibaba.druid.sql.parser.SQLParserFeature;
import com.alibaba.druid.sql.parser.Token;

import java.util.HashMap;
import java.util.Map;

public class SnowflakeLexer extends Lexer {
public static final Keywords SNOWFLAKE_KEYWORDS;

static {
Map<String, Token> map = new HashMap<>();

map.putAll(Keywords.DEFAULT_KEYWORDS.getKeywords());

// Snowflake specific keywords
map.put("BEGIN", Token.BEGIN);
map.put("CASCADE", Token.CASCADE);
map.put("CLONE", Token.CLONE);
map.put("CONTINUE", Token.CONTINUE);
map.put("CURRENT", Token.CURRENT);
map.put("FETCH", Token.FETCH);
map.put("FIRST", Token.FIRST);
map.put("IDENTITY", Token.IDENTITY);
map.put("LIMIT", Token.LIMIT);
map.put("NEXT", Token.NEXT);
map.put("NOWAIT", Token.NOWAIT);
map.put("OF", Token.OF);
map.put("OFFSET", Token.OFFSET);
map.put("ONLY", Token.ONLY);
map.put("QUALIFY", Token.QUALIFY);
map.put("RECURSIVE", Token.RECURSIVE);
map.put("RESTART", Token.RESTART);
map.put("RESTRICT", Token.RESTRICT);
map.put("RETURNING", Token.RETURNING);
map.put("ROW", Token.ROW);
map.put("ROWS", Token.ROWS);
map.put("SHARE", Token.SHARE);
map.put("SHOW", Token.SHOW);
map.put("START", Token.START);
map.put("TRUE", Token.TRUE);
map.put("FALSE", Token.FALSE);
map.put("ARRAY", Token.ARRAY);
map.put("IF", Token.IF);
map.put("TYPE", Token.TYPE);
map.put("ILIKE", Token.ILIKE);
map.put("MERGE", Token.MERGE);
map.put("MATCHED", Token.MATCHED);
map.put("PARTITION", Token.PARTITION);
map.put("INTERVAL", Token.INTERVAL);
map.put("LANGUAGE", Token.LANGUAGE);
map.put("LOCAL", Token.LOCAL);
map.put("TOP", Token.TOP);
map.put("USING", Token.USING);
map.put("WINDOW", Token.WINDOW);
map.put("TABLESAMPLE", Token.TABLESAMPLE);
map.put("REPEATABLE", Token.REPEATABLE);
map.put("STAGE", Token.STAGE);
map.put("PIPE", Token.PIPE);
map.put("STREAM", Token.STREAM);
map.put("TASK", Token.TASK);
map.put("WAREHOUSE", Token.WAREHOUSE);
map.put("COPY", Token.COPY);
map.put("OVERWRITE", Token.OVERWRITE);
map.put("PIVOT", Token.PIVOT);
map.put("UNPIVOT", Token.UNPIVOT);
map.put("LATERAL", Token.LATERAL);
map.put("AT", Token.AT);
map.put("BEFORE", Token.BEFORE);
map.put("STATEMENT", Token.STATEMENT);
map.put("TIMESTAMP", Token.TIMESTAMP);
map.put("UNDROP", Token.UNDROP);
map.put("MASKING", Token.MASKING);
map.put("POLICY", Token.POLICY);
map.put("NETWORK", Token.NETWORK);
map.put("INTEGRATION", Token.INTEGRATION);
map.put("NOTIFICATION", Token.NOTIFICATION);
map.put("SECURITY", Token.SECURITY);
map.put("API", Token.API);
map.put("POOL", Token.POOL);
map.put("MONITOR", Token.MONITOR);
map.put("ALERT", Token.ALERT);
map.put("APPLICATION", Token.APPLICATION);
map.put("SERVICE", Token.SERVICE);
map.put("IMAGE", Token.IMAGE);
map.put("MINING", Token.MINING);

SNOWFLAKE_KEYWORDS = new Keywords(map);
}

@Override
protected Keywords loadKeywords() {
return SNOWFLAKE_KEYWORDS;
}

public SnowflakeLexer(String input, SQLParserFeature... features) {
super(input);
dbType = DbType.snowflake;
Expand Down
53 changes: 53 additions & 0 deletions core/src/main/java/com/alibaba/druid/sql/dialect/snowflake/SnowflakeSelectParser.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,53 @@
package com.alibaba.druid.sql.dialect.snowflake;

import com.alibaba.druid.DbType;
import com.alibaba.druid.sql.ast.SQLObject;
import com.alibaba.druid.sql.ast.SQLOrderBy;
import com.alibaba.druid.sql.ast.SQLSetQuantifier;
import com.alibaba.druid.sql.ast.statement.SQLSelectQuery;
import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
import com.alibaba.druid.sql.parser.SQLExprParser;
import com.alibaba.druid.sql.parser.SQLSelectListCache;
import com.alibaba.druid.sql.parser.SQLSelectParser;
import com.alibaba.druid.sql.parser.Token;

public class SnowflakeSelectParser extends SQLSelectParser {
public SnowflakeSelectParser(SQLExprParser exprParser, SQLSelectListCache selectListCache) {
super(exprParser, selectListCache);
dbType = DbType.snowflake;
}

@Override
public SQLSelectQuery query(SQLObject parent, boolean acceptUnion) {
SQLSelectQueryBlock queryBlock = new SQLSelectQueryBlock(dbType);

if (lexer.nextIf(Token.SELECT)) {
if (lexer.nextIf(Token.DISTINCT)) {
queryBlock.setDistionOption(SQLSetQuantifier.DISTINCT);
} else if (lexer.nextIf(Token.ALL)) {
queryBlock.setDistionOption(SQLSetQuantifier.ALL);
}

parseSelectList(queryBlock);
}

parseFrom(queryBlock);

parseWhere(queryBlock);

parseGroupBy(queryBlock);

qualify(queryBlock);

SQLOrderBy orderBy = parseOrderBy();
if (orderBy != null) {
queryBlock.setOrderBy(orderBy);
}

if (lexer.nextIf(Token.LIMIT)) {
queryBlock.setLimit(this.exprParser.parseLimit());
}

return queryRest(queryBlock, acceptUnion);
}
}
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