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#pragma once
#include <Interpreters/InDepthNodeVisitor.h>
#include <Interpreters/Cluster.h>
namespace DB
{
class ExpressionActions;
using ExpressionActionsPtr = std::shared_ptr<ExpressionActions>;
class ASTFunction;
/// Rewrite `sharding_key IN (...)` for specific shard,
/// so that it will contain only values that belong to this specific shard.
///
/// See also:
/// - evaluateExpressionOverConstantCondition()
/// - StorageDistributed::createSelector()
/// - createBlockSelector()
struct OptimizeShardingKeyRewriteInMatcher
{
/// Cluster::SlotToShard
using SlotToShard = std::vector<UInt64>;
struct Data
{
/// Expression of sharding_key for the Distributed() table
const ExpressionActionsPtr & sharding_key_expr;
/// Type of sharding_key column.
const DataTypePtr & sharding_key_type;
/// Name of the column for sharding_expr
const std::string & sharding_key_column_name;
/// Info for the current shard (to compare shard_num with calculated)
const Cluster::ShardInfo & shard_info;
/// weight -> shard mapping
const Cluster::SlotToShard & slots;
};
static bool needChildVisit(ASTPtr & /*node*/, const ASTPtr & /*child*/);
static void visit(ASTPtr & node, Data & data);
static void visit(ASTFunction & function, Data & data);
};
using OptimizeShardingKeyRewriteInVisitor = InDepthNodeVisitor<OptimizeShardingKeyRewriteInMatcher, true>;
}
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