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#include "duckdb.hpp"
#include "shell_state.hpp"
#include "shell_highlight.hpp"
#include "duckdb/parser/query_node/select_node.hpp"
#include "duckdb/parser/tableref/showref.hpp"
#include "duckdb/parser/tableref/basetableref.hpp"
#include "duckdb/common/box_renderer.hpp"
#include "duckdb/common/map.hpp"
namespace duckdb_shell {
bool ShellState::UseDescribeRenderMode(const duckdb::SQLStatement &statement, string &describe_table_name) {
// identify if this is a DESCRIBE {table} or DESCRIBE {query} statement
// if it is we use the special DESCRIBE render mode
if (statement.type != duckdb::StatementType::SELECT_STATEMENT) {
return false;
}
auto &select = statement.Cast<duckdb::SelectStatement>();
if (select.node->type != duckdb::QueryNodeType::SELECT_NODE) {
return false;
}
auto &select_node = select.node->Cast<duckdb::SelectNode>();
if (select_node.select_list.size() != 1 || select_node.select_list[0]->type != duckdb::ExpressionType::STAR) {
return false;
}
if (select_node.from_table->type != duckdb::TableReferenceType::SHOW_REF) {
return false;
}
auto &showref = select_node.from_table->Cast<duckdb::ShowRef>();
if (showref.show_type != duckdb::ShowType::DESCRIBE) {
return false;
}
describe_table_name = "Describe";
if (!showref.table_name.empty()) {
describe_table_name = showref.table_name;
} else if (showref.query && showref.query->type == duckdb::QueryNodeType::SELECT_NODE) {
auto &show_select = showref.query->Cast<duckdb::SelectNode>();
if (show_select.from_table->type == duckdb::TableReferenceType::BASE_TABLE) {
auto &base_table = show_select.from_table->Cast<duckdb::BaseTableRef>();
describe_table_name = base_table.table_name;
}
}
return true;
}
struct RenderComponent {
RenderComponent(string text_p, HighlightElementType type) : text(std::move(text_p)), type(type) {
render_width = ShellState::RenderLength(text);
}
string text;
idx_t render_width;
HighlightElementType type;
};
struct ShellColumnRenderInfo {
vector<RenderComponent> components;
};
struct ColumnRenderRow {
vector<ShellColumnRenderInfo> columns;
};
struct ShellTableRenderInfo {
ShellTableRenderInfo(ShellTableInfo table, char decimal_sep);
ShellTableInfo table;
idx_t table_name_length;
idx_t render_width;
vector<idx_t> max_component_widths;
string estimated_size_text;
optional_idx estimated_size_length;
vector<ColumnRenderRow> column_renders;
idx_t LineCount() const {
idx_t constant_count = 4;
if (estimated_size_length.IsValid()) {
constant_count += 2;
}
return ColumnLines() + constant_count;
}
idx_t PerColumnWidth() const {
idx_t width = 4;
for (auto &component_width : max_component_widths) {
width += component_width;
}
width += max_component_widths.size() - 1;
return width;
}
idx_t ColumnLines() const {
return column_renders[0].columns.size();
}
void Truncate(idx_t max_render_width);
static void TruncateValueIfRequired(string &value, idx_t &render_length, idx_t max_render_width);
};
struct TableMetadataLine {
idx_t render_height = 0;
idx_t render_width = 0;
vector<idx_t> max_component_widths;
vector<idx_t> tables;
idx_t PerColumnWidth() const {
idx_t width = 4;
for (auto &component_width : max_component_widths) {
width += component_width;
}
width += max_component_widths.size() - 1;
return width;
}
void RenderLine(ShellHighlight &highlight, const vector<ShellTableRenderInfo> &tables, idx_t line_idx,
bool last_line);
};
struct TableMetadataDisplayInfo {
string database_name;
string schema_name;
idx_t render_height = 0;
idx_t render_width = 0;
vector<TableMetadataLine> display_lines;
};
void TableMetadataLine::RenderLine(ShellHighlight &highlight, const vector<ShellTableRenderInfo> &table_list,
idx_t line_idx, bool last_line) {
// figure out the table to render
idx_t table_idx = 0;
for (; table_idx < tables.size(); table_idx++) {
idx_t line_count = table_list[tables[table_idx]].LineCount();
if (line_idx < line_count) {
// line belongs to this table - render it
break;
}
// line belongs to a subsequent table - subtract line count and move to next table
line_idx -= line_count;
}
if (table_idx == tables.size()) {
// we didn't render any table - break
if (!last_line) {
// we need to add spaces if this is not the last line
highlight.PrintText(string(render_width, ' '), PrintOutput::STDOUT, HighlightElementType::LAYOUT);
}
return;
}
auto &render_table = table_list[tables[table_idx]];
auto &table = render_table.table;
auto layout_type = table.is_view ? HighlightElementType::VIEW_LAYOUT : HighlightElementType::TABLE_LAYOUT;
duckdb::BoxRendererConfig config;
if (line_idx == 0) {
// first line - render layout
string top_line;
top_line = config.LTCORNER;
for (idx_t i = 0; i < render_width - 2; i++) {
top_line += config.HORIZONTAL;
}
top_line += config.RTCORNER;
highlight.PrintText(top_line, PrintOutput::STDOUT, layout_type);
return;
}
if (line_idx == 1) {
// table name
string table_name;
idx_t space_count = render_width - render_table.table_name_length - 2;
idx_t lspace = space_count / 2;
idx_t rspace = space_count - lspace;
string table_line = config.VERTICAL;
table_line += string(lspace, ' ');
highlight.PrintText(table_line, PrintOutput::STDOUT, layout_type);
highlight.PrintText(table.table_name, PrintOutput::STDOUT, HighlightElementType::TABLE_NAME);
table_line = string(rspace, ' ');
table_line += config.VERTICAL;
highlight.PrintText(table_line, PrintOutput::STDOUT, layout_type);
return;
}
if (line_idx > 2 && line_idx < render_table.ColumnLines() + 3) {
idx_t column_idx = line_idx - 3;
// column line
// if we have a long table name the table name might have stretched out the box
// in that case we need to add padding here
// compute the required padding
idx_t total_render_width = render_width;
idx_t per_column_render_width = PerColumnWidth();
idx_t column_render_width = render_table.column_renders.size() * per_column_render_width;
idx_t extra_render_width = total_render_width - column_render_width;
idx_t render_width_per_column = extra_render_width / render_table.column_renders.size();
for (idx_t render_idx = 0; render_idx < render_table.column_renders.size(); render_idx++) {
auto &column_render = render_table.column_renders[render_idx];
string column_line = render_idx == 0 ? config.VERTICAL : " ";
bool is_last = render_idx + 1 == render_table.column_renders.size();
if (column_idx < column_render.columns.size()) {
auto &col = column_render.columns[column_idx];
column_line += " ";
highlight.PrintText(column_line, PrintOutput::STDOUT, layout_type);
// render each of the components
for (idx_t component_idx = 0; component_idx < col.components.size(); component_idx++) {
auto &component = col.components[component_idx];
highlight.PrintText(component.text, PrintOutput::STDOUT, component.type);
// render space padding between components
column_line = string(max_component_widths[component_idx] - component.render_width + 1, ' ');
if (extra_render_width > 0) {
// if we need extra spacing add it
idx_t render_count = is_last ? extra_render_width : render_width_per_column;
column_line += string(render_count, ' ');
extra_render_width -= render_count;
}
highlight.PrintText(column_line, PrintOutput::STDOUT, layout_type);
}
} else {
// we have already rendered all columns for this line - pad with spaces
column_line = string(per_column_render_width - 1, ' ');
highlight.PrintText(column_line, PrintOutput::STDOUT, layout_type);
}
column_line = is_last ? config.VERTICAL : " ";
highlight.PrintText(column_line, PrintOutput::STDOUT, layout_type);
}
return;
}
if (line_idx == 2 || (table.estimated_size.IsValid() && line_idx == render_table.ColumnLines() + 3)) {
// blank line after table name
string blank_line = config.VERTICAL;
blank_line += string(render_width - 2, ' ');
blank_line += config.VERTICAL;
highlight.PrintText(blank_line, PrintOutput::STDOUT, layout_type);
return;
}
if (table.estimated_size.IsValid() && line_idx == render_table.ColumnLines() + 4) {
idx_t space_count = render_width - render_table.estimated_size_length.GetIndex() - 2;
idx_t lspace = space_count / 2;
idx_t rspace = space_count - lspace;
string estimated_size_line = config.VERTICAL;
estimated_size_line += string(lspace, ' ');
highlight.PrintText(estimated_size_line, PrintOutput::STDOUT, layout_type);
highlight.PrintText(render_table.estimated_size_text, PrintOutput::STDOUT, HighlightElementType::COMMENT);
estimated_size_line = string(rspace, ' ');
estimated_size_line += config.VERTICAL;
highlight.PrintText(estimated_size_line, PrintOutput::STDOUT, layout_type);
return;
}
// bottom line
string bottom_line;
bottom_line = config.LDCORNER;
for (idx_t i = 0; i < render_width - 2; i++) {
bottom_line += config.HORIZONTAL;
}
bottom_line += config.RDCORNER;
highlight.PrintText(bottom_line, PrintOutput::STDOUT, layout_type);
}
string FormatTableMetadataType(const string &type) {
auto result = StringUtil::Lower(type);
if (StringUtil::StartsWith(result, "decimal")) {
return "decimal";
}
return result;
}
ShellTableRenderInfo::ShellTableRenderInfo(ShellTableInfo table_p, char decimal_sep) : table(std::move(table_p)) {
table_name_length = ShellState::RenderLength(table.table_name);
ColumnRenderRow render_row;
// figure out if we need an extra line to render constraint info
bool has_constraint_component = false;
for (auto &col : table.columns) {
if (col.is_not_null || col.is_unique || !col.default_value.empty()) {
has_constraint_component = true;
break;
}
}
idx_t component_count = 2 + has_constraint_component;
for (auto &col_p : table.columns) {
ShellColumnRenderInfo col_display;
HighlightElementType column_name_type =
col_p.is_primary_key ? HighlightElementType::PRIMARY_KEY_COLUMN : HighlightElementType::COLUMN_NAME;
col_display.components.emplace_back(std::move(col_p.column_name), column_name_type);
col_display.components.emplace_back(FormatTableMetadataType(col_p.column_type),
HighlightElementType::COLUMN_TYPE);
if (has_constraint_component) {
string constraint_text;
if (col_p.is_not_null) {
constraint_text = "not null";
}
if (col_p.is_unique) {
if (!constraint_text.empty()) {
constraint_text += " ";
}
constraint_text += "unique";
}
if (!col_p.default_value.empty()) {
if (!constraint_text.empty()) {
constraint_text += " ";
}
constraint_text += "default " + col_p.default_value;
}
col_display.components.emplace_back(constraint_text, HighlightElementType::COLUMN_TYPE);
}
render_row.columns.push_back(std::move(col_display));
}
table.columns.clear();
// iterate over the components to find the max length
max_component_widths.resize(component_count);
for (auto &row : render_row.columns) {
if (row.components.size() != component_count) {
throw InternalException("Component count is misaligned");
}
for (idx_t component_idx = 0; component_idx < row.components.size(); component_idx++) {
max_component_widths[component_idx] = duckdb::MaxValue<idx_t>(max_component_widths[component_idx],
row.components[component_idx].render_width);
}
}
column_renders.push_back(std::move(render_row));
render_width = table_name_length + 4;
if (PerColumnWidth() > render_width) {
render_width = PerColumnWidth();
}
if (table.estimated_size.IsValid()) {
estimated_size_text = to_string(table.estimated_size.GetIndex());
auto formatted = duckdb::BoxRenderer::TryFormatLargeNumber(estimated_size_text, decimal_sep);
if (!formatted.empty()) {
estimated_size_text = std::move(formatted);
}
estimated_size_text += " rows";
estimated_size_length = ShellState::RenderLength(estimated_size_text);
if (estimated_size_length.GetIndex() + 4 > render_width) {
render_width = estimated_size_length.GetIndex() + 4;
}
}
}
void ShellTableRenderInfo::TruncateValueIfRequired(string &value, idx_t &render_length, idx_t max_render_width) {
if (render_length <= max_render_width) {
return;
}
duckdb::BoxRendererConfig config;
idx_t pos = 0;
idx_t value_render_width = 0;
value =
duckdb::BoxRenderer::TruncateValue(value, max_render_width - config.DOTDOTDOT_LENGTH, pos, value_render_width) +
config.DOTDOTDOT;
render_length = value_render_width + config.DOTDOTDOT_LENGTH;
}
void ShellTableRenderInfo::Truncate(idx_t max_render_width) {
if (render_width <= max_render_width) {
return;
}
// we exceeded the render width - we need to truncate
TruncateValueIfRequired(table.table_name, table_name_length, max_render_width - 4);
// figure out what we need to truncate
idx_t total_column_length = PerColumnWidth();
if (total_column_length > max_render_width) {
// we need to truncate either column names or column types
// prefer to keep the name as long as possible - only truncate it if it by itself almost exceeds the
// width
static constexpr const idx_t MIN_COMPONENT_SIZE = 5;
idx_t component_count = max_component_widths.size();
idx_t min_leftover_size = component_count * MIN_COMPONENT_SIZE;
if (max_component_widths[0] + min_leftover_size > max_render_width) {
max_component_widths[0] = max_render_width - min_leftover_size;
}
total_column_length = PerColumnWidth();
if (total_column_length > max_render_width) {
// truncate other components if required
for (idx_t i = 1; i < max_component_widths.size(); i++) {
if (max_component_widths[i] <= MIN_COMPONENT_SIZE) {
// cannot truncate below the min component size
continue;
}
idx_t truncate_amount = duckdb::MinValue<idx_t>(total_column_length - max_render_width,
max_component_widths[i] - MIN_COMPONENT_SIZE);
max_component_widths[i] -= truncate_amount;
total_column_length -= truncate_amount;
if (total_column_length <= render_width) {
break;
}
}
}
// truncate all column components that we need to truncate
for (auto &column_render : column_renders) {
for (auto &col : column_render.columns) {
for (idx_t component_idx = 0; component_idx < col.components.size(); component_idx++) {
auto &component = col.components[component_idx];
TruncateValueIfRequired(component.text, component.render_width,
max_component_widths[component_idx]);
}
}
}
}
render_width = max_render_width;
}
void RenderLineDisplay(ShellHighlight &highlight, string text, idx_t total_render_width,
HighlightElementType element_type) {
auto render_size = ShellState::RenderLength(text);
ShellTableRenderInfo::TruncateValueIfRequired(text, render_size, total_render_width - 4);
duckdb::BoxRendererConfig config;
idx_t total_lines = total_render_width - render_size - 4;
idx_t lline = total_lines / 2;
idx_t rline = total_lines - lline;
string middle_line;
middle_line += " ";
for (idx_t i = 0; i < lline; i++) {
middle_line += config.HORIZONTAL;
}
middle_line += " ";
middle_line += text;
middle_line += " ";
for (idx_t i = 0; i < rline; i++) {
middle_line += config.HORIZONTAL;
}
middle_line += " ";
middle_line += "\n";
highlight.PrintText(middle_line, PrintOutput::STDOUT, element_type);
}
idx_t ShellState::GetMaxRenderWidth() const {
idx_t max_render_width = max_width == 0 ? duckdb::Printer::TerminalWidth() : max_width;
if (max_render_width < 80) {
max_render_width = 80;
}
return max_render_width;
}
void ShellState::RenderTableMetadata(vector<ShellTableInfo> &tables) {
idx_t max_render_width = GetMaxRenderWidth();
duckdb::BoxRendererConfig config;
// figure out the render width of each table
vector<ShellTableRenderInfo> table_list;
for (auto &table : tables) {
table_list.emplace_back(table, config.decimal_separator);
}
for (auto &table : table_list) {
// optionally truncate each table if we exceed the max render width
table.Truncate(max_render_width);
}
// try to split up large tables
for (auto &table : table_list) {
static constexpr const idx_t SPLIT_THRESHOLD = 20;
D_ASSERT(table.column_renders.size() == 1);
if (table.column_renders[0].columns.size() <= SPLIT_THRESHOLD) {
// not that many columns - keep it as-is
continue;
}
// try to split up columns if possible
idx_t max_split_count = (table.column_renders[0].columns.size() + SPLIT_THRESHOLD - 1) / SPLIT_THRESHOLD;
idx_t width_per_split = table.PerColumnWidth();
idx_t max_splits = max_render_width / width_per_split;
D_ASSERT(max_split_count > 1);
if (max_splits <= 1) {
// too wide - cannot split
continue;
}
idx_t split_count = duckdb::MinValue<idx_t>(max_split_count, max_splits);
vector<ColumnRenderRow> new_renders;
new_renders.resize(split_count);
idx_t split_idx = 0;
for (auto &col : table.column_renders[0].columns) {
new_renders[split_idx % split_count].columns.push_back(std::move(col));
split_idx++;
}
table.column_renders = std::move(new_renders);
table.render_width = duckdb::MaxValue<idx_t>(table.render_width, split_count * width_per_split);
}
// group tables by db + schema
duckdb::map<string, duckdb::map<string, vector<ShellTableRenderInfo>>> grouped_tables;
for (auto &entry : table_list) {
grouped_tables[entry.table.database_name][entry.table.schema_name].push_back(std::move(entry));
}
vector<TableMetadataDisplayInfo> metadata_displays;
// for each set of table groups - make a list of displays
for (auto &db_entry : grouped_tables) {
for (auto &schema_entry : db_entry.second) {
auto &result = schema_entry.second;
// sort from biggest to smallest table
std::sort(result.begin(), result.end(), [](const ShellTableRenderInfo &a, const ShellTableRenderInfo &b) {
return a.LineCount() > b.LineCount();
});
// try to colocate different tables on the same lines in a greedy manner
duckdb::unordered_set<idx_t> displayed_tables;
for (idx_t table_idx = 0; table_idx < result.size(); table_idx++) {
if (displayed_tables.find(table_idx) != displayed_tables.end()) {
// already displayed
continue;
}
displayed_tables.insert(table_idx);
auto &initial_table = result[table_idx];
TableMetadataDisplayInfo metadata_display;
// the first line always has only one table (this table)
metadata_display.database_name = initial_table.table.database_name;
metadata_display.schema_name = initial_table.table.schema_name;
TableMetadataLine initial_line;
initial_line.tables.push_back(table_idx);
metadata_display.render_width = initial_line.render_width = initial_table.render_width;
metadata_display.render_height = initial_line.render_height = initial_table.LineCount();
initial_line.max_component_widths = initial_table.max_component_widths;
metadata_display.display_lines.push_back(std::move(initial_line));
// now for each table, check if we can co-locate it
for (idx_t next_idx = table_idx + 1; next_idx < result.size(); next_idx++) {
auto ¤t_table = result[next_idx];
auto render_width = current_table.render_width;
auto render_height = current_table.LineCount();
// we have two choices with co-locating
// we can EITHER add a new line
// OR add it to an existing line
// we prefer to add it to an existing line if possible
if (render_height > metadata_display.render_height) {
// if this table is bigger than the current render height we can never add it - so just skip it
continue;
}
bool added = false;
for (auto &existing_line : metadata_display.display_lines) {
if (existing_line.render_height + render_height > metadata_display.render_height) {
// does not fit!
continue;
}
// adding the table here works out height wise - we could potentially add it here
// however, we do need to "stretch" the line to fit the current unit
// get the maximum render width
vector<idx_t> new_max_component_widths;
for (idx_t component_idx = 0; component_idx < existing_line.max_component_widths.size();
component_idx++) {
new_max_component_widths.push_back(
duckdb::MaxValue<idx_t>(existing_line.max_component_widths[component_idx],
current_table.max_component_widths[component_idx]));
}
idx_t new_column_render_width = 3;
for (auto &component_width : new_max_component_widths) {
new_column_render_width += component_width + 1;
}
idx_t new_rendering_width = duckdb::MaxValue<idx_t>(render_width, existing_line.render_width);
new_rendering_width = duckdb::MaxValue<idx_t>(new_rendering_width, new_column_render_width);
D_ASSERT(new_rendering_width >= existing_line.render_width);
idx_t extra_width = new_rendering_width - existing_line.render_width;
if (metadata_display.render_width + extra_width > max_render_width) {
// the extra width makes us exceed the rendering width limit - we cannot add it here
continue;
}
// we can add it here! extend the line and add the table
existing_line.max_component_widths = std::move(new_max_component_widths);
existing_line.render_width += extra_width;
existing_line.render_height += render_height;
existing_line.tables.push_back(next_idx);
added = true;
break;
}
if (!added) {
// if we couldn't add it to an existing line we might still be able to add a new line
// but only if that fits width wise
if (metadata_display.render_width + render_width <= max_render_width) {
// it does! add an extra line
TableMetadataLine new_line;
new_line.tables.push_back(next_idx);
new_line.render_width = render_width;
new_line.render_height = render_height;
new_line.max_component_widths = current_table.max_component_widths;
metadata_display.render_width += render_width;
metadata_display.display_lines.push_back(std::move(new_line));
added = true;
}
}
if (added) {
// we added this table for rendering - add to the displayed tables list
displayed_tables.insert(next_idx);
}
}
std::sort(metadata_display.display_lines.begin(), metadata_display.display_lines.end(),
[](TableMetadataLine &a, TableMetadataLine &b) { return a.render_height > b.render_height; });
metadata_displays.push_back(std::move(metadata_display));
}
}
}
idx_t line_count = 0;
for (auto &display_line : metadata_displays) {
line_count += display_line.render_height;
}
unique_ptr<PagerState> pager_setup;
if (ShouldUsePager(line_count)) {
// we should use a pager
pager_setup = SetupPager();
}
// compute the metadata render width
idx_t metadata_render_width = 0;
for (auto &metadata_display : metadata_displays) {
auto metadata_render_size = ShellState::RenderLength(metadata_display.database_name);
metadata_render_size =
duckdb::MaxValue<idx_t>(metadata_render_size, ShellState::RenderLength(metadata_display.schema_name));
metadata_render_size = duckdb::MinValue<idx_t>(max_render_width, metadata_render_size + 6);
metadata_render_width = duckdb::MaxValue<idx_t>(metadata_render_width, metadata_render_size);
metadata_render_width = duckdb::MaxValue<idx_t>(metadata_render_width, metadata_display.render_width);
}
// render the metadata
ShellHighlight highlight(*this);
string last_displayed_database;
string last_displayed_schema;
for (auto &metadata_display : metadata_displays) {
// check if we should render the database and/or schema name for this batch of tables
if (!metadata_display.database_name.empty() && last_displayed_database != metadata_display.database_name) {
RenderLineDisplay(highlight, metadata_display.database_name, metadata_render_width,
HighlightElementType::DATABASE_NAME);
last_displayed_database = metadata_display.database_name;
last_displayed_schema = string();
}
if (!metadata_display.schema_name.empty() && last_displayed_schema != metadata_display.schema_name) {
RenderLineDisplay(highlight, metadata_display.schema_name, metadata_render_width,
HighlightElementType::SCHEMA_NAME);
last_displayed_schema = metadata_display.schema_name;
}
for (idx_t line_idx = 0; line_idx < metadata_display.render_height; line_idx++) {
// construct the line
for (idx_t table_line_idx = 0; table_line_idx < metadata_display.display_lines.size(); table_line_idx++) {
bool is_last = table_line_idx + 1 == metadata_display.display_lines.size();
auto &group_table_list = grouped_tables[metadata_display.database_name][metadata_display.schema_name];
metadata_display.display_lines[table_line_idx].RenderLine(highlight, group_table_list, line_idx,
is_last);
}
highlight.PrintText("\n", PrintOutput::STDOUT, HighlightElementType::LAYOUT);
}
}
}
} // namespace duckdb_shell
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